subr_autoconf.c revision 1.163.4.2.4.2
1 /* $NetBSD: subr_autoconf.c,v 1.163.4.2.4.2 2011/02/08 06:04:59 cliff 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 1.163.4.2.4.2 2011/02/08 06:04:59 cliff Exp $"); 81 82 #include "opt_multiprocessor.h" 83 #include "opt_ddb.h" 84 #include "drvctl.h" 85 86 #include <sys/param.h> 87 #include <sys/device.h> 88 #include <sys/disklabel.h> 89 #include <sys/conf.h> 90 #include <sys/kauth.h> 91 #include <sys/malloc.h> 92 #include <sys/kmem.h> 93 #include <sys/systm.h> 94 #include <sys/kernel.h> 95 #include <sys/errno.h> 96 #include <sys/proc.h> 97 #include <sys/reboot.h> 98 #include <sys/kthread.h> 99 #include <sys/buf.h> 100 #include <sys/dirent.h> 101 #include <sys/vnode.h> 102 #include <sys/mount.h> 103 #include <sys/namei.h> 104 #include <sys/unistd.h> 105 #include <sys/fcntl.h> 106 #include <sys/lockf.h> 107 #include <sys/callout.h> 108 #include <sys/mutex.h> 109 #include <sys/condvar.h> 110 #include <sys/devmon.h> 111 #include <sys/cpu.h> 112 113 #include <sys/disk.h> 114 115 #include <machine/limits.h> 116 117 #include "opt_userconf.h" 118 #ifdef USERCONF 119 #include <sys/userconf.h> 120 #endif 121 122 #ifdef __i386__ 123 #include "opt_splash.h" 124 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 125 #include <dev/splash/splash.h> 126 extern struct splash_progress *splash_progress_state; 127 #endif 128 #endif 129 130 /* 131 * Autoconfiguration subroutines. 132 */ 133 134 typedef struct pmf_private { 135 int pp_nwait; 136 int pp_nlock; 137 lwp_t *pp_holder; 138 kmutex_t pp_mtx; 139 kcondvar_t pp_cv; 140 } pmf_private_t; 141 142 /* 143 * ioconf.c exports exactly two names: cfdata and cfroots. All system 144 * devices and drivers are found via these tables. 145 */ 146 extern struct cfdata cfdata[]; 147 extern const short cfroots[]; 148 149 /* 150 * List of all cfdriver structures. We use this to detect duplicates 151 * when other cfdrivers are loaded. 152 */ 153 struct cfdriverlist allcfdrivers = LIST_HEAD_INITIALIZER(&allcfdrivers); 154 extern struct cfdriver * const cfdriver_list_initial[]; 155 156 /* 157 * Initial list of cfattach's. 158 */ 159 extern const struct cfattachinit cfattachinit[]; 160 161 /* 162 * List of cfdata tables. We always have one such list -- the one 163 * built statically when the kernel was configured. 164 */ 165 struct cftablelist allcftables = TAILQ_HEAD_INITIALIZER(allcftables); 166 static struct cftable initcftable; 167 168 #define ROOT ((device_t)NULL) 169 170 struct matchinfo { 171 cfsubmatch_t fn; 172 struct device *parent; 173 const int *locs; 174 void *aux; 175 struct cfdata *match; 176 int pri; 177 }; 178 179 static char *number(char *, int); 180 static void mapply(struct matchinfo *, cfdata_t); 181 static device_t config_devalloc(const device_t, const cfdata_t, const int *); 182 static void config_devdealloc(device_t); 183 static void config_makeroom(int, struct cfdriver *); 184 static void config_devlink(device_t); 185 static void config_devunlink(device_t); 186 187 static void pmflock_debug(device_t, const char *, int); 188 static void pmflock_debug_with_flags(device_t, const char *, int PMF_FN_PROTO); 189 190 static device_t deviter_next1(deviter_t *); 191 static void deviter_reinit(deviter_t *); 192 193 struct deferred_config { 194 TAILQ_ENTRY(deferred_config) dc_queue; 195 device_t dc_dev; 196 void (*dc_func)(device_t); 197 }; 198 199 TAILQ_HEAD(deferred_config_head, deferred_config); 200 201 /* 202 * config_queues_lock protects MP access to 203 * - deferred_config_queue 204 * - interrupt_config_queue 205 * is held for short durations, and is initialized to spin 206 */ 207 static kmutex_t config_queues_lock; 208 209 /* 210 * dc_funcs_lock ensures the driver dc_func's are not called concurrently 211 * many (most?) are not MP safe 212 * is held for unknown durations, and is initialized to sleep 213 */ 214 static kmutex_t dc_funcs_lock; 215 216 struct deferred_config_head deferred_config_queue = 217 TAILQ_HEAD_INITIALIZER(deferred_config_queue); 218 struct deferred_config_head interrupt_config_queue = 219 TAILQ_HEAD_INITIALIZER(interrupt_config_queue); 220 int interrupt_config_threads = 8; 221 222 static void config_process_deferred(struct deferred_config_head *, device_t); 223 224 /* Hooks to finalize configuration once all real devices have been found. */ 225 struct finalize_hook { 226 TAILQ_ENTRY(finalize_hook) f_list; 227 int (*f_func)(device_t); 228 device_t f_dev; 229 }; 230 static TAILQ_HEAD(, finalize_hook) config_finalize_list = 231 TAILQ_HEAD_INITIALIZER(config_finalize_list); 232 static int config_finalize_done; 233 234 /* list of all devices */ 235 struct devicelist alldevs = TAILQ_HEAD_INITIALIZER(alldevs); 236 kcondvar_t alldevs_cv; 237 kmutex_t alldevs_mtx; 238 static int alldevs_nread = 0; 239 static int alldevs_nwrite = 0; 240 static lwp_t *alldevs_writer = NULL; 241 242 static int config_pending; /* semaphore for mountroot */ 243 static kmutex_t config_misc_lock; 244 static kcondvar_t config_misc_cv; 245 246 #define STREQ(s1, s2) \ 247 (*(s1) == *(s2) && strcmp((s1), (s2)) == 0) 248 249 static int config_initialized; /* config_init() has been called. */ 250 251 static int config_do_twiddle; 252 253 struct vnode * 254 opendisk(struct device *dv) 255 { 256 int bmajor, bminor; 257 struct vnode *tmpvn; 258 int error; 259 dev_t dev; 260 261 /* 262 * Lookup major number for disk block device. 263 */ 264 bmajor = devsw_name2blk(device_xname(dv), NULL, 0); 265 if (bmajor == -1) 266 return NULL; 267 268 bminor = minor(device_unit(dv)); 269 /* 270 * Fake a temporary vnode for the disk, open it, and read 271 * and hash the sectors. 272 */ 273 dev = device_is_a(dv, "dk") ? makedev(bmajor, bminor) : 274 MAKEDISKDEV(bmajor, bminor, RAW_PART); 275 if (bdevvp(dev, &tmpvn)) 276 panic("%s: can't alloc vnode for %s", __func__, 277 device_xname(dv)); 278 error = VOP_OPEN(tmpvn, FREAD, NOCRED); 279 if (error) { 280 #ifndef DEBUG 281 /* 282 * Ignore errors caused by missing device, partition, 283 * or medium. 284 */ 285 if (error != ENXIO && error != ENODEV) 286 #endif 287 printf("%s: can't open dev %s (%d)\n", 288 __func__, device_xname(dv), error); 289 vput(tmpvn); 290 return NULL; 291 } 292 293 return tmpvn; 294 } 295 296 int 297 config_handle_wedges(struct device *dv, int par) 298 { 299 struct dkwedge_list wl; 300 struct dkwedge_info *wi; 301 struct vnode *vn; 302 char diskname[16]; 303 int i, error; 304 305 if ((vn = opendisk(dv)) == NULL) 306 return -1; 307 308 wl.dkwl_bufsize = sizeof(*wi) * 16; 309 wl.dkwl_buf = wi = malloc(wl.dkwl_bufsize, M_TEMP, M_WAITOK); 310 311 error = VOP_IOCTL(vn, DIOCLWEDGES, &wl, FREAD, NOCRED); 312 VOP_CLOSE(vn, FREAD, NOCRED); 313 vput(vn); 314 if (error) { 315 #ifdef DEBUG_WEDGE 316 printf("%s: List wedges returned %d\n", 317 device_xname(dv), error); 318 #endif 319 free(wi, M_TEMP); 320 return -1; 321 } 322 323 #ifdef DEBUG_WEDGE 324 printf("%s: Returned %u(%u) wedges\n", device_xname(dv), 325 wl.dkwl_nwedges, wl.dkwl_ncopied); 326 #endif 327 snprintf(diskname, sizeof(diskname), "%s%c", device_xname(dv), 328 par + 'a'); 329 330 for (i = 0; i < wl.dkwl_ncopied; i++) { 331 #ifdef DEBUG_WEDGE 332 printf("%s: Looking for %s in %s\n", 333 device_xname(dv), diskname, wi[i].dkw_wname); 334 #endif 335 if (strcmp(wi[i].dkw_wname, diskname) == 0) 336 break; 337 } 338 339 if (i == wl.dkwl_ncopied) { 340 #ifdef DEBUG_WEDGE 341 printf("%s: Cannot find wedge with parent %s\n", 342 device_xname(dv), diskname); 343 #endif 344 free(wi, M_TEMP); 345 return -1; 346 } 347 348 #ifdef DEBUG_WEDGE 349 printf("%s: Setting boot wedge %s (%s) at %llu %llu\n", 350 device_xname(dv), wi[i].dkw_devname, wi[i].dkw_wname, 351 (unsigned long long)wi[i].dkw_offset, 352 (unsigned long long)wi[i].dkw_size); 353 #endif 354 dkwedge_set_bootwedge(dv, wi[i].dkw_offset, wi[i].dkw_size); 355 free(wi, M_TEMP); 356 return 0; 357 } 358 359 /* 360 * Initialize the autoconfiguration data structures. Normally this 361 * is done by configure(), but some platforms need to do this very 362 * early (to e.g. initialize the console). 363 */ 364 void 365 config_init(void) 366 { 367 const struct cfattachinit *cfai; 368 int i, j; 369 370 if (config_initialized) 371 return; 372 373 mutex_init(&alldevs_mtx, MUTEX_DEFAULT, IPL_NONE); 374 cv_init(&alldevs_cv, "alldevs"); 375 376 mutex_init(&config_misc_lock, MUTEX_DEFAULT, IPL_NONE); 377 cv_init(&config_misc_cv, "cfgmisc"); 378 379 mutex_init(&dc_funcs_lock, MUTEX_DEFAULT, IPL_SOFTNET); 380 381 mutex_init(&config_queues_lock, MUTEX_DEFAULT, IPL_VM); 382 383 /* allcfdrivers is statically initialized. */ 384 for (i = 0; cfdriver_list_initial[i] != NULL; i++) { 385 if (config_cfdriver_attach(cfdriver_list_initial[i]) != 0) 386 panic("configure: duplicate `%s' drivers", 387 cfdriver_list_initial[i]->cd_name); 388 } 389 390 for (cfai = &cfattachinit[0]; cfai->cfai_name != NULL; cfai++) { 391 for (j = 0; cfai->cfai_list[j] != NULL; j++) { 392 if (config_cfattach_attach(cfai->cfai_name, 393 cfai->cfai_list[j]) != 0) 394 panic("configure: duplicate `%s' attachment " 395 "of `%s' driver", 396 cfai->cfai_list[j]->ca_name, 397 cfai->cfai_name); 398 } 399 } 400 401 initcftable.ct_cfdata = cfdata; 402 TAILQ_INSERT_TAIL(&allcftables, &initcftable, ct_list); 403 404 config_initialized = 1; 405 } 406 407 void 408 config_deferred(device_t dev) 409 { 410 config_process_deferred(&deferred_config_queue, dev); 411 config_process_deferred(&interrupt_config_queue, dev); 412 } 413 414 static void 415 config_interrupts_thread(void *cookie) 416 { 417 struct deferred_config *dc; 418 419 mutex_enter(&config_queues_lock); 420 while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) { 421 TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue); 422 mutex_exit(&config_queues_lock); 423 mutex_enter(&dc_funcs_lock); 424 (*dc->dc_func)(dc->dc_dev); 425 mutex_exit(&dc_funcs_lock); 426 kmem_free(dc, sizeof(*dc)); 427 config_pending_decr(); 428 mutex_enter(&config_queues_lock); 429 } 430 mutex_exit(&config_queues_lock); 431 432 kthread_exit(0); 433 } 434 435 /* 436 * Configure the system's hardware. 437 */ 438 void 439 configure(void) 440 { 441 /* Initialize data structures. */ 442 config_init(); 443 pmf_init(); 444 #if NDRVCTL > 0 445 drvctl_init(); 446 #endif 447 448 #ifdef USERCONF 449 if (boothowto & RB_USERCONF) 450 user_config(); 451 #endif 452 453 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 454 config_do_twiddle = 1; 455 printf_nolog("Detecting hardware..."); 456 } 457 458 /* 459 * Do the machine-dependent portion of autoconfiguration. This 460 * sets the configuration machinery here in motion by "finding" 461 * the root bus. When this function returns, we expect interrupts 462 * to be enabled. 463 */ 464 cpu_configure(); 465 } 466 467 void 468 configure2(void) 469 { 470 CPU_INFO_ITERATOR cii; 471 struct cpu_info *ci; 472 int i, s; 473 474 /* 475 * Now that we've found all the hardware, start the real time 476 * and statistics clocks. 477 */ 478 initclocks(); 479 480 cold = 0; /* clocks are running, we're warm now! */ 481 s = splsched(); 482 curcpu()->ci_schedstate.spc_flags |= SPCF_RUNNING; 483 splx(s); 484 485 /* Boot the secondary processors. */ 486 for (CPU_INFO_FOREACH(cii, ci)) { 487 uvm_cpu_attach(ci); 488 } 489 mp_online = true; 490 #if defined(MULTIPROCESSOR) 491 cpu_boot_secondary_processors(); 492 #endif 493 494 /* Setup the runqueues and scheduler. */ 495 runq_init(); 496 sched_init(); 497 498 /* 499 * Create threads to call back and finish configuration for 500 * devices that want interrupts enabled. 501 */ 502 for (i = 0; i < interrupt_config_threads; i++) { 503 (void)kthread_create(PRI_NONE, 0, NULL, 504 config_interrupts_thread, NULL, NULL, "config"); 505 } 506 507 /* Get the threads going and into any sleeps before continuing. */ 508 yield(); 509 } 510 511 /* 512 * Announce device attach/detach to userland listeners. 513 */ 514 static void 515 devmon_report_device(device_t dev, bool isattach) 516 { 517 #if NDRVCTL > 0 518 prop_dictionary_t ev; 519 const char *parent; 520 const char *what; 521 device_t pdev = device_parent(dev); 522 523 ev = prop_dictionary_create(); 524 if (ev == NULL) 525 return; 526 527 what = (isattach ? "device-attach" : "device-detach"); 528 parent = (pdev == NULL ? "root" : device_xname(pdev)); 529 if (!prop_dictionary_set_cstring(ev, "device", device_xname(dev)) || 530 !prop_dictionary_set_cstring(ev, "parent", parent)) { 531 prop_object_release(ev); 532 return; 533 } 534 535 devmon_insert(what, ev); 536 #endif 537 } 538 539 /* 540 * Add a cfdriver to the system. 541 */ 542 int 543 config_cfdriver_attach(struct cfdriver *cd) 544 { 545 struct cfdriver *lcd; 546 547 /* Make sure this driver isn't already in the system. */ 548 LIST_FOREACH(lcd, &allcfdrivers, cd_list) { 549 if (STREQ(lcd->cd_name, cd->cd_name)) 550 return (EEXIST); 551 } 552 553 LIST_INIT(&cd->cd_attach); 554 LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list); 555 556 return (0); 557 } 558 559 /* 560 * Remove a cfdriver from the system. 561 */ 562 int 563 config_cfdriver_detach(struct cfdriver *cd) 564 { 565 int i; 566 567 /* Make sure there are no active instances. */ 568 for (i = 0; i < cd->cd_ndevs; i++) { 569 if (cd->cd_devs[i] != NULL) 570 return (EBUSY); 571 } 572 573 /* ...and no attachments loaded. */ 574 if (LIST_EMPTY(&cd->cd_attach) == 0) 575 return (EBUSY); 576 577 LIST_REMOVE(cd, cd_list); 578 579 KASSERT(cd->cd_devs == NULL); 580 581 return (0); 582 } 583 584 /* 585 * Look up a cfdriver by name. 586 */ 587 struct cfdriver * 588 config_cfdriver_lookup(const char *name) 589 { 590 struct cfdriver *cd; 591 592 LIST_FOREACH(cd, &allcfdrivers, cd_list) { 593 if (STREQ(cd->cd_name, name)) 594 return (cd); 595 } 596 597 return (NULL); 598 } 599 600 /* 601 * Add a cfattach to the specified driver. 602 */ 603 int 604 config_cfattach_attach(const char *driver, struct cfattach *ca) 605 { 606 struct cfattach *lca; 607 struct cfdriver *cd; 608 609 cd = config_cfdriver_lookup(driver); 610 if (cd == NULL) 611 return (ESRCH); 612 613 /* Make sure this attachment isn't already on this driver. */ 614 LIST_FOREACH(lca, &cd->cd_attach, ca_list) { 615 if (STREQ(lca->ca_name, ca->ca_name)) 616 return (EEXIST); 617 } 618 619 LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list); 620 621 return (0); 622 } 623 624 /* 625 * Remove a cfattach from the specified driver. 626 */ 627 int 628 config_cfattach_detach(const char *driver, struct cfattach *ca) 629 { 630 struct cfdriver *cd; 631 device_t dev; 632 int i; 633 634 cd = config_cfdriver_lookup(driver); 635 if (cd == NULL) 636 return (ESRCH); 637 638 /* Make sure there are no active instances. */ 639 for (i = 0; i < cd->cd_ndevs; i++) { 640 if ((dev = cd->cd_devs[i]) == NULL) 641 continue; 642 if (dev->dv_cfattach == ca) 643 return (EBUSY); 644 } 645 646 LIST_REMOVE(ca, ca_list); 647 648 return (0); 649 } 650 651 /* 652 * Look up a cfattach by name. 653 */ 654 static struct cfattach * 655 config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname) 656 { 657 struct cfattach *ca; 658 659 LIST_FOREACH(ca, &cd->cd_attach, ca_list) { 660 if (STREQ(ca->ca_name, atname)) 661 return (ca); 662 } 663 664 return (NULL); 665 } 666 667 /* 668 * Look up a cfattach by driver/attachment name. 669 */ 670 struct cfattach * 671 config_cfattach_lookup(const char *name, const char *atname) 672 { 673 struct cfdriver *cd; 674 675 cd = config_cfdriver_lookup(name); 676 if (cd == NULL) 677 return (NULL); 678 679 return (config_cfattach_lookup_cd(cd, atname)); 680 } 681 682 /* 683 * Apply the matching function and choose the best. This is used 684 * a few times and we want to keep the code small. 685 */ 686 static void 687 mapply(struct matchinfo *m, cfdata_t cf) 688 { 689 int pri; 690 691 if (m->fn != NULL) { 692 pri = (*m->fn)(m->parent, cf, m->locs, m->aux); 693 } else { 694 pri = config_match(m->parent, cf, m->aux); 695 } 696 if (pri > m->pri) { 697 m->match = cf; 698 m->pri = pri; 699 } 700 } 701 702 int 703 config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux) 704 { 705 const struct cfiattrdata *ci; 706 const struct cflocdesc *cl; 707 int nlocs, i; 708 709 ci = cfiattr_lookup(cf->cf_pspec->cfp_iattr, parent->dv_cfdriver); 710 KASSERT(ci); 711 nlocs = ci->ci_loclen; 712 KASSERT(!nlocs || locs); 713 for (i = 0; i < nlocs; i++) { 714 cl = &ci->ci_locdesc[i]; 715 /* !cld_defaultstr means no default value */ 716 if ((!(cl->cld_defaultstr) 717 || (cf->cf_loc[i] != cl->cld_default)) 718 && cf->cf_loc[i] != locs[i]) 719 return (0); 720 } 721 722 return (config_match(parent, cf, aux)); 723 } 724 725 /* 726 * Helper function: check whether the driver supports the interface attribute 727 * and return its descriptor structure. 728 */ 729 static const struct cfiattrdata * 730 cfdriver_get_iattr(const struct cfdriver *cd, const char *ia) 731 { 732 const struct cfiattrdata * const *cpp; 733 734 if (cd->cd_attrs == NULL) 735 return (0); 736 737 for (cpp = cd->cd_attrs; *cpp; cpp++) { 738 if (STREQ((*cpp)->ci_name, ia)) { 739 /* Match. */ 740 return (*cpp); 741 } 742 } 743 return (0); 744 } 745 746 /* 747 * Lookup an interface attribute description by name. 748 * If the driver is given, consider only its supported attributes. 749 */ 750 const struct cfiattrdata * 751 cfiattr_lookup(const char *name, const struct cfdriver *cd) 752 { 753 const struct cfdriver *d; 754 const struct cfiattrdata *ia; 755 756 if (cd) 757 return (cfdriver_get_iattr(cd, name)); 758 759 LIST_FOREACH(d, &allcfdrivers, cd_list) { 760 ia = cfdriver_get_iattr(d, name); 761 if (ia) 762 return (ia); 763 } 764 return (0); 765 } 766 767 /* 768 * Determine if `parent' is a potential parent for a device spec based 769 * on `cfp'. 770 */ 771 static int 772 cfparent_match(const device_t parent, const struct cfparent *cfp) 773 { 774 struct cfdriver *pcd; 775 776 /* We don't match root nodes here. */ 777 if (cfp == NULL) 778 return (0); 779 780 pcd = parent->dv_cfdriver; 781 KASSERT(pcd != NULL); 782 783 /* 784 * First, ensure this parent has the correct interface 785 * attribute. 786 */ 787 if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr)) 788 return (0); 789 790 /* 791 * If no specific parent device instance was specified (i.e. 792 * we're attaching to the attribute only), we're done! 793 */ 794 if (cfp->cfp_parent == NULL) 795 return (1); 796 797 /* 798 * Check the parent device's name. 799 */ 800 if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0) 801 return (0); /* not the same parent */ 802 803 /* 804 * Make sure the unit number matches. 805 */ 806 if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */ 807 cfp->cfp_unit == parent->dv_unit) 808 return (1); 809 810 /* Unit numbers don't match. */ 811 return (0); 812 } 813 814 /* 815 * Helper for config_cfdata_attach(): check all devices whether it could be 816 * parent any attachment in the config data table passed, and rescan. 817 */ 818 static void 819 rescan_with_cfdata(const struct cfdata *cf) 820 { 821 device_t d; 822 const struct cfdata *cf1; 823 deviter_t di; 824 825 826 /* 827 * "alldevs" is likely longer than an LKM's cfdata, so make it 828 * the outer loop. 829 */ 830 for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) { 831 832 if (!(d->dv_cfattach->ca_rescan)) 833 continue; 834 835 for (cf1 = cf; cf1->cf_name; cf1++) { 836 837 if (!cfparent_match(d, cf1->cf_pspec)) 838 continue; 839 840 (*d->dv_cfattach->ca_rescan)(d, 841 cf1->cf_pspec->cfp_iattr, cf1->cf_loc); 842 } 843 } 844 deviter_release(&di); 845 } 846 847 /* 848 * Attach a supplemental config data table and rescan potential 849 * parent devices if required. 850 */ 851 int 852 config_cfdata_attach(cfdata_t cf, int scannow) 853 { 854 struct cftable *ct; 855 856 ct = kmem_alloc(sizeof(*ct), KM_SLEEP); 857 ct->ct_cfdata = cf; 858 TAILQ_INSERT_TAIL(&allcftables, ct, ct_list); 859 860 if (scannow) 861 rescan_with_cfdata(cf); 862 863 return (0); 864 } 865 866 /* 867 * Helper for config_cfdata_detach: check whether a device is 868 * found through any attachment in the config data table. 869 */ 870 static int 871 dev_in_cfdata(const struct device *d, const struct cfdata *cf) 872 { 873 const struct cfdata *cf1; 874 875 for (cf1 = cf; cf1->cf_name; cf1++) 876 if (d->dv_cfdata == cf1) 877 return (1); 878 879 return (0); 880 } 881 882 /* 883 * Detach a supplemental config data table. Detach all devices found 884 * through that table (and thus keeping references to it) before. 885 */ 886 int 887 config_cfdata_detach(cfdata_t cf) 888 { 889 device_t d; 890 int error = 0; 891 struct cftable *ct; 892 deviter_t di; 893 894 for (d = deviter_first(&di, DEVITER_F_RW); d != NULL; 895 d = deviter_next(&di)) { 896 if (!dev_in_cfdata(d, cf)) 897 continue; 898 if ((error = config_detach(d, 0)) != 0) 899 break; 900 } 901 deviter_release(&di); 902 if (error) { 903 aprint_error_dev(d, "unable to detach instance\n"); 904 return error; 905 } 906 907 TAILQ_FOREACH(ct, &allcftables, ct_list) { 908 if (ct->ct_cfdata == cf) { 909 TAILQ_REMOVE(&allcftables, ct, ct_list); 910 kmem_free(ct, sizeof(*ct)); 911 return (0); 912 } 913 } 914 915 /* not found -- shouldn't happen */ 916 return (EINVAL); 917 } 918 919 /* 920 * Invoke the "match" routine for a cfdata entry on behalf of 921 * an external caller, usually a "submatch" routine. 922 */ 923 int 924 config_match(device_t parent, cfdata_t cf, void *aux) 925 { 926 struct cfattach *ca; 927 928 ca = config_cfattach_lookup(cf->cf_name, cf->cf_atname); 929 if (ca == NULL) { 930 /* No attachment for this entry, oh well. */ 931 return (0); 932 } 933 934 return ((*ca->ca_match)(parent, cf, aux)); 935 } 936 937 /* 938 * Iterate over all potential children of some device, calling the given 939 * function (default being the child's match function) for each one. 940 * Nonzero returns are matches; the highest value returned is considered 941 * the best match. Return the `found child' if we got a match, or NULL 942 * otherwise. The `aux' pointer is simply passed on through. 943 * 944 * Note that this function is designed so that it can be used to apply 945 * an arbitrary function to all potential children (its return value 946 * can be ignored). 947 */ 948 cfdata_t 949 config_search_loc(cfsubmatch_t fn, device_t parent, 950 const char *ifattr, const int *locs, void *aux) 951 { 952 struct cftable *ct; 953 cfdata_t cf; 954 struct matchinfo m; 955 956 KASSERT(config_initialized); 957 KASSERT(!ifattr || cfdriver_get_iattr(parent->dv_cfdriver, ifattr)); 958 959 m.fn = fn; 960 m.parent = parent; 961 m.locs = locs; 962 m.aux = aux; 963 m.match = NULL; 964 m.pri = 0; 965 966 TAILQ_FOREACH(ct, &allcftables, ct_list) { 967 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 968 969 /* We don't match root nodes here. */ 970 if (!cf->cf_pspec) 971 continue; 972 973 /* 974 * Skip cf if no longer eligible, otherwise scan 975 * through parents for one matching `parent', and 976 * try match function. 977 */ 978 if (cf->cf_fstate == FSTATE_FOUND) 979 continue; 980 if (cf->cf_fstate == FSTATE_DNOTFOUND || 981 cf->cf_fstate == FSTATE_DSTAR) 982 continue; 983 984 /* 985 * If an interface attribute was specified, 986 * consider only children which attach to 987 * that attribute. 988 */ 989 if (ifattr && !STREQ(ifattr, cf->cf_pspec->cfp_iattr)) 990 continue; 991 992 if (cfparent_match(parent, cf->cf_pspec)) 993 mapply(&m, cf); 994 } 995 } 996 return (m.match); 997 } 998 999 cfdata_t 1000 config_search_ia(cfsubmatch_t fn, device_t parent, const char *ifattr, 1001 void *aux) 1002 { 1003 1004 return (config_search_loc(fn, parent, ifattr, NULL, aux)); 1005 } 1006 1007 /* 1008 * Find the given root device. 1009 * This is much like config_search, but there is no parent. 1010 * Don't bother with multiple cfdata tables; the root node 1011 * must always be in the initial table. 1012 */ 1013 cfdata_t 1014 config_rootsearch(cfsubmatch_t fn, const char *rootname, void *aux) 1015 { 1016 cfdata_t cf; 1017 const short *p; 1018 struct matchinfo m; 1019 1020 m.fn = fn; 1021 m.parent = ROOT; 1022 m.aux = aux; 1023 m.match = NULL; 1024 m.pri = 0; 1025 m.locs = 0; 1026 /* 1027 * Look at root entries for matching name. We do not bother 1028 * with found-state here since only one root should ever be 1029 * searched (and it must be done first). 1030 */ 1031 for (p = cfroots; *p >= 0; p++) { 1032 cf = &cfdata[*p]; 1033 if (strcmp(cf->cf_name, rootname) == 0) 1034 mapply(&m, cf); 1035 } 1036 return (m.match); 1037 } 1038 1039 static const char * const msgs[3] = { "", " not configured\n", " unsupported\n" }; 1040 1041 /* 1042 * The given `aux' argument describes a device that has been found 1043 * on the given parent, but not necessarily configured. Locate the 1044 * configuration data for that device (using the submatch function 1045 * provided, or using candidates' cd_match configuration driver 1046 * functions) and attach it, and return true. If the device was 1047 * not configured, call the given `print' function and return 0. 1048 */ 1049 device_t 1050 config_found_sm_loc(device_t parent, 1051 const char *ifattr, const int *locs, void *aux, 1052 cfprint_t print, cfsubmatch_t submatch) 1053 { 1054 cfdata_t cf; 1055 1056 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1057 if (splash_progress_state) 1058 splash_progress_update(splash_progress_state); 1059 #endif 1060 1061 if ((cf = config_search_loc(submatch, parent, ifattr, locs, aux))) 1062 return(config_attach_loc(parent, cf, locs, aux, print)); 1063 if (print) { 1064 if (config_do_twiddle) 1065 twiddle(); 1066 aprint_normal("%s", msgs[(*print)(aux, device_xname(parent))]); 1067 } 1068 1069 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1070 if (splash_progress_state) 1071 splash_progress_update(splash_progress_state); 1072 #endif 1073 1074 return (NULL); 1075 } 1076 1077 device_t 1078 config_found_ia(device_t parent, const char *ifattr, void *aux, 1079 cfprint_t print) 1080 { 1081 1082 return (config_found_sm_loc(parent, ifattr, NULL, aux, print, NULL)); 1083 } 1084 1085 device_t 1086 config_found(device_t parent, void *aux, cfprint_t print) 1087 { 1088 1089 return (config_found_sm_loc(parent, NULL, NULL, aux, print, NULL)); 1090 } 1091 1092 /* 1093 * As above, but for root devices. 1094 */ 1095 device_t 1096 config_rootfound(const char *rootname, void *aux) 1097 { 1098 cfdata_t cf; 1099 1100 if ((cf = config_rootsearch((cfsubmatch_t)NULL, rootname, aux)) != NULL) 1101 return (config_attach(ROOT, cf, aux, (cfprint_t)NULL)); 1102 aprint_error("root device %s not configured\n", rootname); 1103 return (NULL); 1104 } 1105 1106 /* just like sprintf(buf, "%d") except that it works from the end */ 1107 static char * 1108 number(char *ep, int n) 1109 { 1110 1111 *--ep = 0; 1112 while (n >= 10) { 1113 *--ep = (n % 10) + '0'; 1114 n /= 10; 1115 } 1116 *--ep = n + '0'; 1117 return (ep); 1118 } 1119 1120 /* 1121 * Expand the size of the cd_devs array if necessary. 1122 */ 1123 static void 1124 config_makeroom(int n, struct cfdriver *cd) 1125 { 1126 const km_flag_t kmflags = (cold ? KM_NOSLEEP : KM_SLEEP); 1127 int old, new; 1128 device_t *nsp; 1129 1130 if (n < cd->cd_ndevs) 1131 return; 1132 1133 /* 1134 * Need to expand the array. 1135 */ 1136 old = cd->cd_ndevs; 1137 if (old == 0) 1138 new = 4; 1139 else 1140 new = old * 2; 1141 while (new <= n) 1142 new *= 2; 1143 cd->cd_ndevs = new; 1144 nsp = kmem_alloc(sizeof(device_t [new]), kmflags); 1145 if (nsp == NULL) 1146 panic("config_attach: %sing dev array", 1147 old != 0 ? "expand" : "creat"); 1148 memset(nsp + old, 0, sizeof(device_t [new - old])); 1149 if (old != 0) { 1150 memcpy(nsp, cd->cd_devs, sizeof(device_t [old])); 1151 kmem_free(cd->cd_devs, sizeof(device_t [old])); 1152 } 1153 cd->cd_devs = nsp; 1154 } 1155 1156 static void 1157 config_devlink(device_t dev) 1158 { 1159 struct cfdriver *cd = dev->dv_cfdriver; 1160 1161 /* put this device in the devices array */ 1162 config_makeroom(dev->dv_unit, cd); 1163 if (cd->cd_devs[dev->dv_unit]) 1164 panic("config_attach: duplicate %s", device_xname(dev)); 1165 cd->cd_devs[dev->dv_unit] = dev; 1166 1167 /* It is safe to add a device to the tail of the list while 1168 * readers are in the list, but not while a writer is in 1169 * the list. Wait for any writer to complete. 1170 */ 1171 mutex_enter(&alldevs_mtx); 1172 while (alldevs_nwrite != 0 && alldevs_writer != curlwp) 1173 cv_wait(&alldevs_cv, &alldevs_mtx); 1174 TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); /* link up */ 1175 cv_signal(&alldevs_cv); 1176 mutex_exit(&alldevs_mtx); 1177 } 1178 1179 static void 1180 config_devunlink(device_t dev) 1181 { 1182 struct cfdriver *cd = dev->dv_cfdriver; 1183 int i; 1184 1185 /* Unlink from device list. */ 1186 TAILQ_REMOVE(&alldevs, dev, dv_list); 1187 1188 /* Remove from cfdriver's array. */ 1189 cd->cd_devs[dev->dv_unit] = NULL; 1190 1191 /* 1192 * If the device now has no units in use, deallocate its softc array. 1193 */ 1194 for (i = 0; i < cd->cd_ndevs; i++) { 1195 if (cd->cd_devs[i] != NULL) 1196 return; 1197 } 1198 /* nothing found; deallocate */ 1199 kmem_free(cd->cd_devs, sizeof(device_t [cd->cd_ndevs])); 1200 cd->cd_devs = NULL; 1201 cd->cd_ndevs = 0; 1202 } 1203 1204 static device_t 1205 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1206 { 1207 struct cfdriver *cd; 1208 struct cfattach *ca; 1209 size_t lname, lunit; 1210 const char *xunit; 1211 int myunit; 1212 char num[10]; 1213 device_t dev; 1214 void *dev_private; 1215 const struct cfiattrdata *ia; 1216 const km_flag_t kmflags = (cold ? KM_NOSLEEP : KM_SLEEP); 1217 1218 cd = config_cfdriver_lookup(cf->cf_name); 1219 if (cd == NULL) 1220 return (NULL); 1221 1222 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1223 if (ca == NULL) 1224 return (NULL); 1225 1226 if ((ca->ca_flags & DVF_PRIV_ALLOC) == 0 && 1227 ca->ca_devsize < sizeof(struct device)) 1228 panic("config_devalloc: %s", cf->cf_atname); 1229 1230 #ifndef __BROKEN_CONFIG_UNIT_USAGE 1231 if (cf->cf_fstate == FSTATE_STAR) { 1232 for (myunit = cf->cf_unit; myunit < cd->cd_ndevs; myunit++) 1233 if (cd->cd_devs[myunit] == NULL) 1234 break; 1235 /* 1236 * myunit is now the unit of the first NULL device pointer, 1237 * or max(cd->cd_ndevs,cf->cf_unit). 1238 */ 1239 } else { 1240 myunit = cf->cf_unit; 1241 if (myunit < cd->cd_ndevs && cd->cd_devs[myunit] != NULL) 1242 return (NULL); 1243 } 1244 #else 1245 myunit = cf->cf_unit; 1246 #endif /* ! __BROKEN_CONFIG_UNIT_USAGE */ 1247 1248 /* compute length of name and decimal expansion of unit number */ 1249 lname = strlen(cd->cd_name); 1250 xunit = number(&num[sizeof(num)], myunit); 1251 lunit = &num[sizeof(num)] - xunit; 1252 if (lname + lunit > sizeof(dev->dv_xname)) 1253 panic("config_devalloc: device name too long"); 1254 1255 /* get memory for all device vars */ 1256 KASSERT((ca->ca_flags & DVF_PRIV_ALLOC) || ca->ca_devsize >= sizeof(struct device)); 1257 if (ca->ca_devsize > 0) { 1258 dev_private = kmem_zalloc(ca->ca_devsize, kmflags); 1259 if (dev_private == NULL) 1260 panic("config_devalloc: memory allocation for device softc failed"); 1261 } else { 1262 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1263 dev_private = NULL; 1264 } 1265 1266 if ((ca->ca_flags & DVF_PRIV_ALLOC) != 0) { 1267 dev = kmem_zalloc(sizeof(*dev), kmflags); 1268 } else { 1269 dev = dev_private; 1270 } 1271 if (dev == NULL) 1272 panic("config_devalloc: memory allocation for device_t failed"); 1273 1274 dev->dv_class = cd->cd_class; 1275 dev->dv_cfdata = cf; 1276 dev->dv_cfdriver = cd; 1277 dev->dv_cfattach = ca; 1278 dev->dv_unit = myunit; 1279 dev->dv_activity_count = 0; 1280 dev->dv_activity_handlers = NULL; 1281 dev->dv_private = dev_private; 1282 memcpy(dev->dv_xname, cd->cd_name, lname); 1283 memcpy(dev->dv_xname + lname, xunit, lunit); 1284 dev->dv_parent = parent; 1285 if (parent != NULL) 1286 dev->dv_depth = parent->dv_depth + 1; 1287 else 1288 dev->dv_depth = 0; 1289 dev->dv_flags = DVF_ACTIVE; /* always initially active */ 1290 dev->dv_flags |= ca->ca_flags; /* inherit flags from class */ 1291 if (locs) { 1292 KASSERT(parent); /* no locators at root */ 1293 ia = cfiattr_lookup(cf->cf_pspec->cfp_iattr, 1294 parent->dv_cfdriver); 1295 dev->dv_locators = 1296 kmem_alloc(sizeof(int [ia->ci_loclen + 1]), kmflags); 1297 *dev->dv_locators++ = sizeof(int [ia->ci_loclen + 1]); 1298 memcpy(dev->dv_locators, locs, sizeof(int [ia->ci_loclen])); 1299 } 1300 dev->dv_properties = prop_dictionary_create(); 1301 KASSERT(dev->dv_properties != NULL); 1302 1303 prop_dictionary_set_cstring_nocopy(dev->dv_properties, 1304 "device-driver", dev->dv_cfdriver->cd_name); 1305 prop_dictionary_set_uint16(dev->dv_properties, 1306 "device-unit", dev->dv_unit); 1307 1308 return (dev); 1309 } 1310 1311 static void 1312 config_devdealloc(device_t dev) 1313 { 1314 int priv = (dev->dv_flags & DVF_PRIV_ALLOC); 1315 1316 KASSERT(dev->dv_properties != NULL); 1317 prop_object_release(dev->dv_properties); 1318 1319 if (dev->dv_activity_handlers) 1320 panic("config_devdealloc with registered handlers"); 1321 1322 if (dev->dv_locators) { 1323 size_t amount = *--dev->dv_locators; 1324 kmem_free(dev->dv_locators, amount); 1325 } 1326 1327 if (dev->dv_cfattach->ca_devsize > 0) 1328 kmem_free(dev->dv_private, dev->dv_cfattach->ca_devsize); 1329 if (priv) 1330 kmem_free(dev, sizeof(*dev)); 1331 } 1332 1333 /* 1334 * Attach a found device. 1335 */ 1336 device_t 1337 config_attach_loc(device_t parent, cfdata_t cf, 1338 const int *locs, void *aux, cfprint_t print) 1339 { 1340 device_t dev; 1341 struct cftable *ct; 1342 const char *drvname; 1343 1344 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1345 if (splash_progress_state) 1346 splash_progress_update(splash_progress_state); 1347 #endif 1348 1349 dev = config_devalloc(parent, cf, locs); 1350 if (!dev) 1351 panic("config_attach: allocation of device softc failed"); 1352 1353 /* XXX redundant - see below? */ 1354 if (cf->cf_fstate != FSTATE_STAR) { 1355 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1356 cf->cf_fstate = FSTATE_FOUND; 1357 } 1358 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1359 else 1360 cf->cf_unit++; 1361 #endif 1362 1363 config_devlink(dev); 1364 1365 if (config_do_twiddle) 1366 twiddle(); 1367 else 1368 aprint_naive("Found "); 1369 /* 1370 * We want the next two printfs for normal, verbose, and quiet, 1371 * but not silent (in which case, we're twiddling, instead). 1372 */ 1373 if (parent == ROOT) { 1374 aprint_naive("%s (root)", device_xname(dev)); 1375 aprint_normal("%s (root)", device_xname(dev)); 1376 } else { 1377 aprint_naive("%s at %s", device_xname(dev), device_xname(parent)); 1378 aprint_normal("%s at %s", device_xname(dev), device_xname(parent)); 1379 if (print) 1380 (void) (*print)(aux, NULL); 1381 } 1382 1383 /* 1384 * Before attaching, clobber any unfound devices that are 1385 * otherwise identical. 1386 * XXX code above is redundant? 1387 */ 1388 drvname = dev->dv_cfdriver->cd_name; 1389 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1390 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1391 if (STREQ(cf->cf_name, drvname) && 1392 cf->cf_unit == dev->dv_unit) { 1393 if (cf->cf_fstate == FSTATE_NOTFOUND) 1394 cf->cf_fstate = FSTATE_FOUND; 1395 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1396 /* 1397 * Bump the unit number on all starred cfdata 1398 * entries for this device. 1399 */ 1400 if (cf->cf_fstate == FSTATE_STAR) 1401 cf->cf_unit++; 1402 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 1403 } 1404 } 1405 } 1406 #ifdef __HAVE_DEVICE_REGISTER 1407 device_register(dev, aux); 1408 #endif 1409 1410 /* Let userland know */ 1411 devmon_report_device(dev, true); 1412 1413 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1414 if (splash_progress_state) 1415 splash_progress_update(splash_progress_state); 1416 #endif 1417 (*dev->dv_cfattach->ca_attach)(parent, dev, aux); 1418 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1419 if (splash_progress_state) 1420 splash_progress_update(splash_progress_state); 1421 #endif 1422 1423 if (!device_pmf_is_registered(dev)) 1424 aprint_debug_dev(dev, "WARNING: power management not supported\n"); 1425 1426 config_process_deferred(&deferred_config_queue, dev); 1427 return (dev); 1428 } 1429 1430 device_t 1431 config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print) 1432 { 1433 1434 return (config_attach_loc(parent, cf, NULL, aux, print)); 1435 } 1436 1437 /* 1438 * As above, but for pseudo-devices. Pseudo-devices attached in this 1439 * way are silently inserted into the device tree, and their children 1440 * attached. 1441 * 1442 * Note that because pseudo-devices are attached silently, any information 1443 * the attach routine wishes to print should be prefixed with the device 1444 * name by the attach routine. 1445 */ 1446 device_t 1447 config_attach_pseudo(cfdata_t cf) 1448 { 1449 device_t dev; 1450 1451 dev = config_devalloc(ROOT, cf, NULL); 1452 if (!dev) 1453 return (NULL); 1454 1455 /* XXX mark busy in cfdata */ 1456 1457 config_devlink(dev); 1458 1459 #if 0 /* XXXJRT not yet */ 1460 #ifdef __HAVE_DEVICE_REGISTER 1461 device_register(dev, NULL); /* like a root node */ 1462 #endif 1463 #endif 1464 (*dev->dv_cfattach->ca_attach)(ROOT, dev, NULL); 1465 config_process_deferred(&deferred_config_queue, dev); 1466 return (dev); 1467 } 1468 1469 /* 1470 * Detach a device. Optionally forced (e.g. because of hardware 1471 * removal) and quiet. Returns zero if successful, non-zero 1472 * (an error code) otherwise. 1473 * 1474 * Note that this code wants to be run from a process context, so 1475 * that the detach can sleep to allow processes which have a device 1476 * open to run and unwind their stacks. 1477 */ 1478 int 1479 config_detach(device_t dev, int flags) 1480 { 1481 struct cftable *ct; 1482 cfdata_t cf; 1483 const struct cfattach *ca; 1484 struct cfdriver *cd; 1485 #ifdef DIAGNOSTIC 1486 device_t d; 1487 #endif 1488 int rv = 0; 1489 1490 #ifdef DIAGNOSTIC 1491 cf = dev->dv_cfdata; 1492 if (cf != NULL && cf->cf_fstate != FSTATE_FOUND && 1493 cf->cf_fstate != FSTATE_STAR) 1494 panic("config_detach: %s: bad device fstate %d", 1495 device_xname(dev), cf ? cf->cf_fstate : -1); 1496 #endif 1497 cd = dev->dv_cfdriver; 1498 KASSERT(cd != NULL); 1499 1500 ca = dev->dv_cfattach; 1501 KASSERT(ca != NULL); 1502 1503 KASSERT(curlwp != NULL); 1504 mutex_enter(&alldevs_mtx); 1505 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 1506 ; 1507 else while (alldevs_nread != 0 || 1508 (alldevs_nwrite != 0 && alldevs_writer != curlwp)) 1509 cv_wait(&alldevs_cv, &alldevs_mtx); 1510 if (alldevs_nwrite++ == 0) 1511 alldevs_writer = curlwp; 1512 mutex_exit(&alldevs_mtx); 1513 1514 /* 1515 * Ensure the device is deactivated. If the device doesn't 1516 * have an activation entry point, we allow DVF_ACTIVE to 1517 * remain set. Otherwise, if DVF_ACTIVE is still set, the 1518 * device is busy, and the detach fails. 1519 */ 1520 if (ca->ca_activate != NULL) 1521 rv = config_deactivate(dev); 1522 1523 /* 1524 * Try to detach the device. If that's not possible, then 1525 * we either panic() (for the forced but failed case), or 1526 * return an error. 1527 */ 1528 if (rv == 0) { 1529 if (ca->ca_detach != NULL) 1530 rv = (*ca->ca_detach)(dev, flags); 1531 else 1532 rv = EOPNOTSUPP; 1533 } 1534 if (rv != 0) { 1535 if ((flags & DETACH_FORCE) == 0) 1536 goto out; 1537 else 1538 panic("config_detach: forced detach of %s failed (%d)", 1539 device_xname(dev), rv); 1540 } 1541 1542 /* 1543 * The device has now been successfully detached. 1544 */ 1545 1546 /* Let userland know */ 1547 devmon_report_device(dev, false); 1548 1549 #ifdef DIAGNOSTIC 1550 /* 1551 * Sanity: If you're successfully detached, you should have no 1552 * children. (Note that because children must be attached 1553 * after parents, we only need to search the latter part of 1554 * the list.) 1555 */ 1556 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1557 d = TAILQ_NEXT(d, dv_list)) { 1558 if (d->dv_parent == dev) { 1559 printf("config_detach: detached device %s" 1560 " has children %s\n", device_xname(dev), device_xname(d)); 1561 panic("config_detach"); 1562 } 1563 } 1564 #endif 1565 1566 /* notify the parent that the child is gone */ 1567 if (dev->dv_parent) { 1568 device_t p = dev->dv_parent; 1569 if (p->dv_cfattach->ca_childdetached) 1570 (*p->dv_cfattach->ca_childdetached)(p, dev); 1571 } 1572 1573 /* 1574 * Mark cfdata to show that the unit can be reused, if possible. 1575 */ 1576 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1577 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1578 if (STREQ(cf->cf_name, cd->cd_name)) { 1579 if (cf->cf_fstate == FSTATE_FOUND && 1580 cf->cf_unit == dev->dv_unit) 1581 cf->cf_fstate = FSTATE_NOTFOUND; 1582 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1583 /* 1584 * Note that we can only re-use a starred 1585 * unit number if the unit being detached 1586 * had the last assigned unit number. 1587 */ 1588 if (cf->cf_fstate == FSTATE_STAR && 1589 cf->cf_unit == dev->dv_unit + 1) 1590 cf->cf_unit--; 1591 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 1592 } 1593 } 1594 } 1595 1596 config_devunlink(dev); 1597 1598 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1599 aprint_normal_dev(dev, "detached\n"); 1600 1601 config_devdealloc(dev); 1602 1603 out: 1604 mutex_enter(&alldevs_mtx); 1605 if (--alldevs_nwrite == 0) 1606 alldevs_writer = NULL; 1607 cv_signal(&alldevs_cv); 1608 mutex_exit(&alldevs_mtx); 1609 return rv; 1610 } 1611 1612 int 1613 config_detach_children(device_t parent, int flags) 1614 { 1615 device_t dv; 1616 deviter_t di; 1617 int error = 0; 1618 1619 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1620 dv = deviter_next(&di)) { 1621 if (device_parent(dv) != parent) 1622 continue; 1623 if ((error = config_detach(dv, flags)) != 0) 1624 break; 1625 } 1626 deviter_release(&di); 1627 return error; 1628 } 1629 1630 int 1631 config_activate(device_t dev) 1632 { 1633 const struct cfattach *ca = dev->dv_cfattach; 1634 int rv = 0, oflags = dev->dv_flags; 1635 1636 if (ca->ca_activate == NULL) 1637 return (EOPNOTSUPP); 1638 1639 if ((dev->dv_flags & DVF_ACTIVE) == 0) { 1640 dev->dv_flags |= DVF_ACTIVE; 1641 rv = (*ca->ca_activate)(dev, DVACT_ACTIVATE); 1642 if (rv) 1643 dev->dv_flags = oflags; 1644 } 1645 return (rv); 1646 } 1647 1648 int 1649 config_deactivate(device_t dev) 1650 { 1651 const struct cfattach *ca = dev->dv_cfattach; 1652 int rv = 0, oflags = dev->dv_flags; 1653 1654 if (ca->ca_activate == NULL) 1655 return (EOPNOTSUPP); 1656 1657 if (dev->dv_flags & DVF_ACTIVE) { 1658 dev->dv_flags &= ~DVF_ACTIVE; 1659 rv = (*ca->ca_activate)(dev, DVACT_DEACTIVATE); 1660 if (rv) 1661 dev->dv_flags = oflags; 1662 } 1663 return (rv); 1664 } 1665 1666 /* 1667 * Defer the configuration of the specified device until all 1668 * of its parent's devices have been attached. 1669 */ 1670 void 1671 config_defer(device_t dev, void (*func)(device_t)) 1672 { 1673 const km_flag_t kmflags = (cold ? KM_NOSLEEP : KM_SLEEP); 1674 struct deferred_config *dc; 1675 1676 if (dev->dv_parent == NULL) 1677 panic("config_defer: can't defer config of a root device"); 1678 1679 #ifdef DIAGNOSTIC 1680 mutex_enter(&config_queues_lock); 1681 for (dc = TAILQ_FIRST(&deferred_config_queue); dc != NULL; 1682 dc = TAILQ_NEXT(dc, dc_queue)) { 1683 if (dc->dc_dev == dev) 1684 panic("config_defer: deferred twice"); 1685 } 1686 mutex_exit(&config_queues_lock); 1687 #endif 1688 1689 dc = kmem_alloc(sizeof(*dc), kmflags); 1690 if (dc == NULL) 1691 panic("config_defer: unable to allocate callback"); 1692 1693 dc->dc_dev = dev; 1694 dc->dc_func = func; 1695 1696 mutex_enter(&config_queues_lock); 1697 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 1698 mutex_exit(&config_queues_lock); 1699 1700 config_pending_incr(); 1701 } 1702 1703 /* 1704 * Defer some autoconfiguration for a device until after interrupts 1705 * are enabled. 1706 */ 1707 void 1708 config_interrupts(device_t dev, void (*func)(device_t)) 1709 { 1710 const km_flag_t kmflags = (cold ? KM_NOSLEEP : KM_SLEEP); 1711 struct deferred_config *dc; 1712 1713 /* 1714 * If interrupts are enabled, callback now. 1715 */ 1716 if (cold == 0) { 1717 (*func)(dev); 1718 return; 1719 } 1720 1721 #ifdef DIAGNOSTIC 1722 mutex_enter(&config_queues_lock); 1723 for (dc = TAILQ_FIRST(&interrupt_config_queue); dc != NULL; 1724 dc = TAILQ_NEXT(dc, dc_queue)) { 1725 if (dc->dc_dev == dev) 1726 panic("config_interrupts: deferred twice"); 1727 } 1728 mutex_exit(&config_queues_lock); 1729 #endif 1730 1731 dc = kmem_alloc(sizeof(*dc), kmflags); 1732 if (dc == NULL) 1733 panic("config_interrupts: unable to allocate callback"); 1734 1735 dc->dc_dev = dev; 1736 dc->dc_func = func; 1737 mutex_enter(&config_queues_lock); 1738 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 1739 mutex_exit(&config_queues_lock); 1740 config_pending_incr(); 1741 } 1742 1743 /* 1744 * Process a deferred configuration queue. 1745 */ 1746 static void 1747 config_process_deferred(struct deferred_config_head *queue, 1748 device_t parent) 1749 { 1750 struct deferred_config *dc, *ndc; 1751 1752 mutex_enter(&config_queues_lock); 1753 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 1754 ndc = TAILQ_NEXT(dc, dc_queue); 1755 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 1756 TAILQ_REMOVE(queue, dc, dc_queue); 1757 mutex_exit(&config_queues_lock); 1758 mutex_enter(&dc_funcs_lock); 1759 (*dc->dc_func)(dc->dc_dev); 1760 mutex_exit(&dc_funcs_lock); 1761 kmem_free(dc, sizeof(*dc)); 1762 config_pending_decr(); 1763 mutex_enter(&config_queues_lock); 1764 } 1765 } 1766 mutex_exit(&config_queues_lock); 1767 } 1768 1769 /* 1770 * Manipulate the config_pending semaphore. 1771 */ 1772 void 1773 config_pending_incr(void) 1774 { 1775 1776 mutex_enter(&config_misc_lock); 1777 config_pending++; 1778 mutex_exit(&config_misc_lock); 1779 } 1780 1781 void 1782 config_pending_decr(void) 1783 { 1784 1785 #ifdef DIAGNOSTIC 1786 if (config_pending == 0) 1787 panic("config_pending_decr: config_pending == 0"); 1788 #endif 1789 mutex_enter(&config_misc_lock); 1790 config_pending--; 1791 if (config_pending == 0) 1792 cv_broadcast(&config_misc_cv); 1793 mutex_exit(&config_misc_lock); 1794 } 1795 1796 /* 1797 * Register a "finalization" routine. Finalization routines are 1798 * called iteratively once all real devices have been found during 1799 * autoconfiguration, for as long as any one finalizer has done 1800 * any work. 1801 */ 1802 int 1803 config_finalize_register(device_t dev, int (*fn)(device_t)) 1804 { 1805 struct finalize_hook *f; 1806 1807 /* 1808 * If finalization has already been done, invoke the 1809 * callback function now. 1810 */ 1811 if (config_finalize_done) { 1812 while ((*fn)(dev) != 0) 1813 /* loop */ ; 1814 } 1815 1816 /* Ensure this isn't already on the list. */ 1817 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 1818 if (f->f_func == fn && f->f_dev == dev) 1819 return (EEXIST); 1820 } 1821 1822 f = kmem_alloc(sizeof(*f), KM_SLEEP); 1823 f->f_func = fn; 1824 f->f_dev = dev; 1825 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 1826 1827 return (0); 1828 } 1829 1830 void 1831 config_finalize(void) 1832 { 1833 struct finalize_hook *f; 1834 struct pdevinit *pdev; 1835 extern struct pdevinit pdevinit[]; 1836 int errcnt, rv; 1837 1838 /* 1839 * Now that device driver threads have been created, wait for 1840 * them to finish any deferred autoconfiguration. 1841 */ 1842 mutex_enter(&config_misc_lock); 1843 while (config_pending != 0) 1844 cv_wait(&config_misc_cv, &config_misc_lock); 1845 mutex_exit(&config_misc_lock); 1846 1847 KERNEL_LOCK(1, NULL); 1848 1849 /* Attach pseudo-devices. */ 1850 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 1851 (*pdev->pdev_attach)(pdev->pdev_count); 1852 1853 /* Run the hooks until none of them does any work. */ 1854 do { 1855 rv = 0; 1856 TAILQ_FOREACH(f, &config_finalize_list, f_list) 1857 rv |= (*f->f_func)(f->f_dev); 1858 } while (rv != 0); 1859 1860 config_finalize_done = 1; 1861 1862 /* Now free all the hooks. */ 1863 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 1864 TAILQ_REMOVE(&config_finalize_list, f, f_list); 1865 kmem_free(f, sizeof(*f)); 1866 } 1867 1868 KERNEL_UNLOCK_ONE(NULL); 1869 1870 errcnt = aprint_get_error_count(); 1871 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 1872 (boothowto & AB_VERBOSE) == 0) { 1873 if (config_do_twiddle) { 1874 config_do_twiddle = 0; 1875 printf_nolog("done.\n"); 1876 } 1877 if (errcnt != 0) { 1878 printf("WARNING: %d error%s while detecting hardware; " 1879 "check system log.\n", errcnt, 1880 errcnt == 1 ? "" : "s"); 1881 } 1882 } 1883 } 1884 1885 /* 1886 * device_lookup: 1887 * 1888 * Look up a device instance for a given driver. 1889 */ 1890 device_t 1891 device_lookup(cfdriver_t cd, int unit) 1892 { 1893 1894 if (unit < 0 || unit >= cd->cd_ndevs) 1895 return (NULL); 1896 1897 return (cd->cd_devs[unit]); 1898 } 1899 1900 /* 1901 * device_lookup: 1902 * 1903 * Look up a device instance for a given driver. 1904 */ 1905 void * 1906 device_lookup_private(cfdriver_t cd, int unit) 1907 { 1908 device_t dv; 1909 1910 if (unit < 0 || unit >= cd->cd_ndevs) 1911 return NULL; 1912 1913 if ((dv = cd->cd_devs[unit]) == NULL) 1914 return NULL; 1915 1916 return dv->dv_private; 1917 } 1918 1919 /* 1920 * Accessor functions for the device_t type. 1921 */ 1922 devclass_t 1923 device_class(device_t dev) 1924 { 1925 1926 return (dev->dv_class); 1927 } 1928 1929 cfdata_t 1930 device_cfdata(device_t dev) 1931 { 1932 1933 return (dev->dv_cfdata); 1934 } 1935 1936 cfdriver_t 1937 device_cfdriver(device_t dev) 1938 { 1939 1940 return (dev->dv_cfdriver); 1941 } 1942 1943 cfattach_t 1944 device_cfattach(device_t dev) 1945 { 1946 1947 return (dev->dv_cfattach); 1948 } 1949 1950 int 1951 device_unit(device_t dev) 1952 { 1953 1954 return (dev->dv_unit); 1955 } 1956 1957 const char * 1958 device_xname(device_t dev) 1959 { 1960 1961 return (dev->dv_xname); 1962 } 1963 1964 device_t 1965 device_parent(device_t dev) 1966 { 1967 1968 return (dev->dv_parent); 1969 } 1970 1971 bool 1972 device_is_active(device_t dev) 1973 { 1974 int active_flags; 1975 1976 active_flags = DVF_ACTIVE; 1977 active_flags |= DVF_CLASS_SUSPENDED; 1978 active_flags |= DVF_DRIVER_SUSPENDED; 1979 active_flags |= DVF_BUS_SUSPENDED; 1980 1981 return ((dev->dv_flags & active_flags) == DVF_ACTIVE); 1982 } 1983 1984 bool 1985 device_is_enabled(device_t dev) 1986 { 1987 return (dev->dv_flags & DVF_ACTIVE) == DVF_ACTIVE; 1988 } 1989 1990 bool 1991 device_has_power(device_t dev) 1992 { 1993 int active_flags; 1994 1995 active_flags = DVF_ACTIVE | DVF_BUS_SUSPENDED; 1996 1997 return ((dev->dv_flags & active_flags) == DVF_ACTIVE); 1998 } 1999 2000 int 2001 device_locator(device_t dev, u_int locnum) 2002 { 2003 2004 KASSERT(dev->dv_locators != NULL); 2005 return (dev->dv_locators[locnum]); 2006 } 2007 2008 void * 2009 device_private(device_t dev) 2010 { 2011 2012 /* 2013 * The reason why device_private(NULL) is allowed is to simplify the 2014 * work of a lot of userspace request handlers (i.e., c/bdev 2015 * handlers) which grab cfdriver_t->cd_units[n]. 2016 * It avoids having them test for it to be NULL and only then calling 2017 * device_private. 2018 */ 2019 return dev == NULL ? NULL : dev->dv_private; 2020 } 2021 2022 prop_dictionary_t 2023 device_properties(device_t dev) 2024 { 2025 2026 return (dev->dv_properties); 2027 } 2028 2029 /* 2030 * device_is_a: 2031 * 2032 * Returns true if the device is an instance of the specified 2033 * driver. 2034 */ 2035 bool 2036 device_is_a(device_t dev, const char *dname) 2037 { 2038 2039 return (strcmp(dev->dv_cfdriver->cd_name, dname) == 0); 2040 } 2041 2042 /* 2043 * device_find_by_xname: 2044 * 2045 * Returns the device of the given name or NULL if it doesn't exist. 2046 */ 2047 device_t 2048 device_find_by_xname(const char *name) 2049 { 2050 device_t dv; 2051 deviter_t di; 2052 2053 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 2054 if (strcmp(device_xname(dv), name) == 0) 2055 break; 2056 } 2057 deviter_release(&di); 2058 2059 return dv; 2060 } 2061 2062 /* 2063 * device_find_by_driver_unit: 2064 * 2065 * Returns the device of the given driver name and unit or 2066 * NULL if it doesn't exist. 2067 */ 2068 device_t 2069 device_find_by_driver_unit(const char *name, int unit) 2070 { 2071 struct cfdriver *cd; 2072 2073 if ((cd = config_cfdriver_lookup(name)) == NULL) 2074 return NULL; 2075 return device_lookup(cd, unit); 2076 } 2077 2078 /* 2079 * Power management related functions. 2080 */ 2081 2082 bool 2083 device_pmf_is_registered(device_t dev) 2084 { 2085 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 2086 } 2087 2088 bool 2089 device_pmf_driver_suspend(device_t dev PMF_FN_ARGS) 2090 { 2091 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2092 return true; 2093 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2094 return false; 2095 if (*dev->dv_driver_suspend != NULL && 2096 !(*dev->dv_driver_suspend)(dev PMF_FN_CALL)) 2097 return false; 2098 2099 dev->dv_flags |= DVF_DRIVER_SUSPENDED; 2100 return true; 2101 } 2102 2103 bool 2104 device_pmf_driver_resume(device_t dev PMF_FN_ARGS) 2105 { 2106 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2107 return true; 2108 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2109 return false; 2110 if ((flags & PMF_F_SELF) != 0 && !device_is_self_suspended(dev)) 2111 return false; 2112 if (*dev->dv_driver_resume != NULL && 2113 !(*dev->dv_driver_resume)(dev PMF_FN_CALL)) 2114 return false; 2115 2116 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 2117 return true; 2118 } 2119 2120 bool 2121 device_pmf_driver_shutdown(device_t dev, int how) 2122 { 2123 2124 if (*dev->dv_driver_shutdown != NULL && 2125 !(*dev->dv_driver_shutdown)(dev, how)) 2126 return false; 2127 return true; 2128 } 2129 2130 bool 2131 device_pmf_driver_register(device_t dev, 2132 bool (*suspend)(device_t PMF_FN_PROTO), 2133 bool (*resume)(device_t PMF_FN_PROTO), 2134 bool (*shutdown)(device_t, int)) 2135 { 2136 pmf_private_t *pp; 2137 2138 if ((pp = kmem_zalloc(sizeof(*pp), KM_NOSLEEP)) == NULL) 2139 return false; 2140 mutex_init(&pp->pp_mtx, MUTEX_DEFAULT, IPL_NONE); 2141 cv_init(&pp->pp_cv, "pmfsusp"); 2142 dev->dv_pmf_private = pp; 2143 2144 dev->dv_driver_suspend = suspend; 2145 dev->dv_driver_resume = resume; 2146 dev->dv_driver_shutdown = shutdown; 2147 dev->dv_flags |= DVF_POWER_HANDLERS; 2148 return true; 2149 } 2150 2151 static const char * 2152 curlwp_name(void) 2153 { 2154 if (curlwp->l_name != NULL) 2155 return curlwp->l_name; 2156 else 2157 return curlwp->l_proc->p_comm; 2158 } 2159 2160 void 2161 device_pmf_driver_deregister(device_t dev) 2162 { 2163 pmf_private_t *pp = dev->dv_pmf_private; 2164 2165 /* XXX avoid crash in case we are not initialized */ 2166 if (!pp) 2167 return; 2168 2169 dev->dv_driver_suspend = NULL; 2170 dev->dv_driver_resume = NULL; 2171 2172 mutex_enter(&pp->pp_mtx); 2173 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2174 while (pp->pp_nlock > 0 || pp->pp_nwait > 0) { 2175 /* Wake a thread that waits for the lock. That 2176 * thread will fail to acquire the lock, and then 2177 * it will wake the next thread that waits for the 2178 * lock, or else it will wake us. 2179 */ 2180 cv_signal(&pp->pp_cv); 2181 pmflock_debug(dev, __func__, __LINE__); 2182 cv_wait(&pp->pp_cv, &pp->pp_mtx); 2183 pmflock_debug(dev, __func__, __LINE__); 2184 } 2185 dev->dv_pmf_private = NULL; 2186 mutex_exit(&pp->pp_mtx); 2187 2188 cv_destroy(&pp->pp_cv); 2189 mutex_destroy(&pp->pp_mtx); 2190 kmem_free(pp, sizeof(*pp)); 2191 } 2192 2193 bool 2194 device_pmf_driver_child_register(device_t dev) 2195 { 2196 device_t parent = device_parent(dev); 2197 2198 if (parent == NULL || parent->dv_driver_child_register == NULL) 2199 return true; 2200 return (*parent->dv_driver_child_register)(dev); 2201 } 2202 2203 void 2204 device_pmf_driver_set_child_register(device_t dev, 2205 bool (*child_register)(device_t)) 2206 { 2207 dev->dv_driver_child_register = child_register; 2208 } 2209 2210 void 2211 device_pmf_self_resume(device_t dev PMF_FN_ARGS) 2212 { 2213 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2214 if ((dev->dv_flags & DVF_SELF_SUSPENDED) != 0) 2215 dev->dv_flags &= ~DVF_SELF_SUSPENDED; 2216 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2217 } 2218 2219 bool 2220 device_is_self_suspended(device_t dev) 2221 { 2222 return (dev->dv_flags & DVF_SELF_SUSPENDED) != 0; 2223 } 2224 2225 void 2226 device_pmf_self_suspend(device_t dev PMF_FN_ARGS) 2227 { 2228 bool self = (flags & PMF_F_SELF) != 0; 2229 2230 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2231 2232 if (!self) 2233 dev->dv_flags &= ~DVF_SELF_SUSPENDED; 2234 else if (device_is_active(dev)) 2235 dev->dv_flags |= DVF_SELF_SUSPENDED; 2236 2237 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2238 } 2239 2240 static void 2241 pmflock_debug(device_t dev, const char *func, int line) 2242 { 2243 pmf_private_t *pp = device_pmf_private(dev); 2244 2245 aprint_debug_dev(dev, "%s.%d, %s pp_nlock %d pp_nwait %d dv_flags %x\n", 2246 func, line, curlwp_name(), pp->pp_nlock, pp->pp_nwait, 2247 dev->dv_flags); 2248 } 2249 2250 static void 2251 pmflock_debug_with_flags(device_t dev, const char *func, int line PMF_FN_ARGS) 2252 { 2253 pmf_private_t *pp = device_pmf_private(dev); 2254 2255 aprint_debug_dev(dev, "%s.%d, %s pp_nlock %d pp_nwait %d dv_flags %x " 2256 "flags " PMF_FLAGS_FMT "\n", func, line, curlwp_name(), 2257 pp->pp_nlock, pp->pp_nwait, dev->dv_flags PMF_FN_CALL); 2258 } 2259 2260 static bool 2261 device_pmf_lock1(device_t dev PMF_FN_ARGS) 2262 { 2263 pmf_private_t *pp = device_pmf_private(dev); 2264 2265 while (device_pmf_is_registered(dev) && 2266 pp->pp_nlock > 0 && pp->pp_holder != curlwp) { 2267 pp->pp_nwait++; 2268 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2269 cv_wait(&pp->pp_cv, &pp->pp_mtx); 2270 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2271 pp->pp_nwait--; 2272 } 2273 if (!device_pmf_is_registered(dev)) { 2274 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2275 /* We could not acquire the lock, but some other thread may 2276 * wait for it, also. Wake that thread. 2277 */ 2278 cv_signal(&pp->pp_cv); 2279 return false; 2280 } 2281 pp->pp_nlock++; 2282 pp->pp_holder = curlwp; 2283 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2284 return true; 2285 } 2286 2287 bool 2288 device_pmf_lock(device_t dev PMF_FN_ARGS) 2289 { 2290 bool rc; 2291 pmf_private_t *pp = device_pmf_private(dev); 2292 2293 mutex_enter(&pp->pp_mtx); 2294 rc = device_pmf_lock1(dev PMF_FN_CALL); 2295 mutex_exit(&pp->pp_mtx); 2296 2297 return rc; 2298 } 2299 2300 void 2301 device_pmf_unlock(device_t dev PMF_FN_ARGS) 2302 { 2303 pmf_private_t *pp = device_pmf_private(dev); 2304 2305 KASSERT(pp->pp_nlock > 0); 2306 mutex_enter(&pp->pp_mtx); 2307 if (--pp->pp_nlock == 0) 2308 pp->pp_holder = NULL; 2309 cv_signal(&pp->pp_cv); 2310 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2311 mutex_exit(&pp->pp_mtx); 2312 } 2313 2314 void * 2315 device_pmf_private(device_t dev) 2316 { 2317 return dev->dv_pmf_private; 2318 } 2319 2320 void * 2321 device_pmf_bus_private(device_t dev) 2322 { 2323 return dev->dv_bus_private; 2324 } 2325 2326 bool 2327 device_pmf_bus_suspend(device_t dev PMF_FN_ARGS) 2328 { 2329 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2330 return true; 2331 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2332 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2333 return false; 2334 if (*dev->dv_bus_suspend != NULL && 2335 !(*dev->dv_bus_suspend)(dev PMF_FN_CALL)) 2336 return false; 2337 2338 dev->dv_flags |= DVF_BUS_SUSPENDED; 2339 return true; 2340 } 2341 2342 bool 2343 device_pmf_bus_resume(device_t dev PMF_FN_ARGS) 2344 { 2345 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2346 return true; 2347 if ((flags & PMF_F_SELF) != 0 && !device_is_self_suspended(dev)) 2348 return false; 2349 if (*dev->dv_bus_resume != NULL && 2350 !(*dev->dv_bus_resume)(dev PMF_FN_CALL)) 2351 return false; 2352 2353 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2354 return true; 2355 } 2356 2357 bool 2358 device_pmf_bus_shutdown(device_t dev, int how) 2359 { 2360 2361 if (*dev->dv_bus_shutdown != NULL && 2362 !(*dev->dv_bus_shutdown)(dev, how)) 2363 return false; 2364 return true; 2365 } 2366 2367 void 2368 device_pmf_bus_register(device_t dev, void *priv, 2369 bool (*suspend)(device_t PMF_FN_PROTO), 2370 bool (*resume)(device_t PMF_FN_PROTO), 2371 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2372 { 2373 dev->dv_bus_private = priv; 2374 dev->dv_bus_resume = resume; 2375 dev->dv_bus_suspend = suspend; 2376 dev->dv_bus_shutdown = shutdown; 2377 dev->dv_bus_deregister = deregister; 2378 } 2379 2380 void 2381 device_pmf_bus_deregister(device_t dev) 2382 { 2383 if (dev->dv_bus_deregister == NULL) 2384 return; 2385 (*dev->dv_bus_deregister)(dev); 2386 dev->dv_bus_private = NULL; 2387 dev->dv_bus_suspend = NULL; 2388 dev->dv_bus_resume = NULL; 2389 dev->dv_bus_deregister = NULL; 2390 } 2391 2392 void * 2393 device_pmf_class_private(device_t dev) 2394 { 2395 return dev->dv_class_private; 2396 } 2397 2398 bool 2399 device_pmf_class_suspend(device_t dev PMF_FN_ARGS) 2400 { 2401 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2402 return true; 2403 if (*dev->dv_class_suspend != NULL && 2404 !(*dev->dv_class_suspend)(dev PMF_FN_CALL)) 2405 return false; 2406 2407 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2408 return true; 2409 } 2410 2411 bool 2412 device_pmf_class_resume(device_t dev PMF_FN_ARGS) 2413 { 2414 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2415 return true; 2416 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2417 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2418 return false; 2419 if (*dev->dv_class_resume != NULL && 2420 !(*dev->dv_class_resume)(dev PMF_FN_CALL)) 2421 return false; 2422 2423 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2424 return true; 2425 } 2426 2427 void 2428 device_pmf_class_register(device_t dev, void *priv, 2429 bool (*suspend)(device_t PMF_FN_PROTO), 2430 bool (*resume)(device_t PMF_FN_PROTO), 2431 void (*deregister)(device_t)) 2432 { 2433 dev->dv_class_private = priv; 2434 dev->dv_class_suspend = suspend; 2435 dev->dv_class_resume = resume; 2436 dev->dv_class_deregister = deregister; 2437 } 2438 2439 void 2440 device_pmf_class_deregister(device_t dev) 2441 { 2442 if (dev->dv_class_deregister == NULL) 2443 return; 2444 (*dev->dv_class_deregister)(dev); 2445 dev->dv_class_private = NULL; 2446 dev->dv_class_suspend = NULL; 2447 dev->dv_class_resume = NULL; 2448 dev->dv_class_deregister = NULL; 2449 } 2450 2451 bool 2452 device_active(device_t dev, devactive_t type) 2453 { 2454 size_t i; 2455 2456 if (dev->dv_activity_count == 0) 2457 return false; 2458 2459 for (i = 0; i < dev->dv_activity_count; ++i) { 2460 if (dev->dv_activity_handlers[i] == NULL) 2461 break; 2462 (*dev->dv_activity_handlers[i])(dev, type); 2463 } 2464 2465 return true; 2466 } 2467 2468 bool 2469 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2470 { 2471 void (**new_handlers)(device_t, devactive_t); 2472 void (**old_handlers)(device_t, devactive_t); 2473 size_t i, old_size, new_size; 2474 int s; 2475 2476 old_handlers = dev->dv_activity_handlers; 2477 old_size = dev->dv_activity_count; 2478 2479 for (i = 0; i < old_size; ++i) { 2480 KASSERT(old_handlers[i] != handler); 2481 if (old_handlers[i] == NULL) { 2482 old_handlers[i] = handler; 2483 return true; 2484 } 2485 } 2486 2487 new_size = old_size + 4; 2488 new_handlers = kmem_alloc(sizeof(void *[new_size]), KM_SLEEP); 2489 2490 memcpy(new_handlers, old_handlers, sizeof(void *[old_size])); 2491 new_handlers[old_size] = handler; 2492 memset(new_handlers + old_size + 1, 0, 2493 sizeof(int [new_size - (old_size+1)])); 2494 2495 s = splhigh(); 2496 dev->dv_activity_count = new_size; 2497 dev->dv_activity_handlers = new_handlers; 2498 splx(s); 2499 2500 if (old_handlers != NULL) 2501 kmem_free(old_handlers, sizeof(int [old_size])); 2502 2503 return true; 2504 } 2505 2506 void 2507 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2508 { 2509 void (**old_handlers)(device_t, devactive_t); 2510 size_t i, old_size; 2511 int s; 2512 2513 old_handlers = dev->dv_activity_handlers; 2514 old_size = dev->dv_activity_count; 2515 2516 for (i = 0; i < old_size; ++i) { 2517 if (old_handlers[i] == handler) 2518 break; 2519 if (old_handlers[i] == NULL) 2520 return; /* XXX panic? */ 2521 } 2522 2523 if (i == old_size) 2524 return; /* XXX panic? */ 2525 2526 for (; i < old_size - 1; ++i) { 2527 if ((old_handlers[i] = old_handlers[i + 1]) != NULL) 2528 continue; 2529 2530 if (i == 0) { 2531 s = splhigh(); 2532 dev->dv_activity_count = 0; 2533 dev->dv_activity_handlers = NULL; 2534 splx(s); 2535 kmem_free(old_handlers, sizeof(void *[old_size])); 2536 } 2537 return; 2538 } 2539 old_handlers[i] = NULL; 2540 } 2541 2542 /* 2543 * Device Iteration 2544 * 2545 * deviter_t: a device iterator. Holds state for a "walk" visiting 2546 * each device_t's in the device tree. 2547 * 2548 * deviter_init(di, flags): initialize the device iterator `di' 2549 * to "walk" the device tree. deviter_next(di) will return 2550 * the first device_t in the device tree, or NULL if there are 2551 * no devices. 2552 * 2553 * `flags' is one or more of DEVITER_F_RW, indicating that the 2554 * caller intends to modify the device tree by calling 2555 * config_detach(9) on devices in the order that the iterator 2556 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2557 * nearest the "root" of the device tree to be returned, first; 2558 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2559 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2560 * indicating both that deviter_init() should not respect any 2561 * locks on the device tree, and that deviter_next(di) may run 2562 * in more than one LWP before the walk has finished. 2563 * 2564 * Only one DEVITER_F_RW iterator may be in the device tree at 2565 * once. 2566 * 2567 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2568 * 2569 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2570 * DEVITER_F_LEAVES_FIRST are used in combination. 2571 * 2572 * deviter_first(di, flags): initialize the device iterator `di' 2573 * and return the first device_t in the device tree, or NULL 2574 * if there are no devices. The statement 2575 * 2576 * dv = deviter_first(di); 2577 * 2578 * is shorthand for 2579 * 2580 * deviter_init(di); 2581 * dv = deviter_next(di); 2582 * 2583 * deviter_next(di): return the next device_t in the device tree, 2584 * or NULL if there are no more devices. deviter_next(di) 2585 * is undefined if `di' was not initialized with deviter_init() or 2586 * deviter_first(). 2587 * 2588 * deviter_release(di): stops iteration (subsequent calls to 2589 * deviter_next() will return NULL), releases any locks and 2590 * resources held by the device iterator. 2591 * 2592 * Device iteration does not return device_t's in any particular 2593 * order. An iterator will never return the same device_t twice. 2594 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2595 * is called repeatedly on the same `di', it will eventually return 2596 * NULL. It is ok to attach/detach devices during device iteration. 2597 */ 2598 void 2599 deviter_init(deviter_t *di, deviter_flags_t flags) 2600 { 2601 device_t dv; 2602 bool rw; 2603 2604 mutex_enter(&alldevs_mtx); 2605 if ((flags & DEVITER_F_SHUTDOWN) != 0) { 2606 flags |= DEVITER_F_RW; 2607 alldevs_nwrite++; 2608 alldevs_writer = NULL; 2609 alldevs_nread = 0; 2610 } else { 2611 rw = (flags & DEVITER_F_RW) != 0; 2612 2613 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 2614 ; 2615 else while ((alldevs_nwrite != 0 && alldevs_writer != curlwp) || 2616 (rw && alldevs_nread != 0)) 2617 cv_wait(&alldevs_cv, &alldevs_mtx); 2618 2619 if (rw) { 2620 if (alldevs_nwrite++ == 0) 2621 alldevs_writer = curlwp; 2622 } else 2623 alldevs_nread++; 2624 } 2625 mutex_exit(&alldevs_mtx); 2626 2627 memset(di, 0, sizeof(*di)); 2628 2629 di->di_flags = flags; 2630 2631 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2632 case DEVITER_F_LEAVES_FIRST: 2633 TAILQ_FOREACH(dv, &alldevs, dv_list) 2634 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2635 break; 2636 case DEVITER_F_ROOT_FIRST: 2637 TAILQ_FOREACH(dv, &alldevs, dv_list) 2638 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2639 break; 2640 default: 2641 break; 2642 } 2643 2644 deviter_reinit(di); 2645 } 2646 2647 static void 2648 deviter_reinit(deviter_t *di) 2649 { 2650 if ((di->di_flags & DEVITER_F_RW) != 0) 2651 di->di_prev = TAILQ_LAST(&alldevs, devicelist); 2652 else 2653 di->di_prev = TAILQ_FIRST(&alldevs); 2654 } 2655 2656 device_t 2657 deviter_first(deviter_t *di, deviter_flags_t flags) 2658 { 2659 deviter_init(di, flags); 2660 return deviter_next(di); 2661 } 2662 2663 static device_t 2664 deviter_next1(deviter_t *di) 2665 { 2666 device_t dv; 2667 2668 dv = di->di_prev; 2669 2670 if (dv == NULL) 2671 ; 2672 else if ((di->di_flags & DEVITER_F_RW) != 0) 2673 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2674 else 2675 di->di_prev = TAILQ_NEXT(dv, dv_list); 2676 2677 return dv; 2678 } 2679 2680 device_t 2681 deviter_next(deviter_t *di) 2682 { 2683 device_t dv = NULL; 2684 2685 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2686 case 0: 2687 return deviter_next1(di); 2688 case DEVITER_F_LEAVES_FIRST: 2689 while (di->di_curdepth >= 0) { 2690 if ((dv = deviter_next1(di)) == NULL) { 2691 di->di_curdepth--; 2692 deviter_reinit(di); 2693 } else if (dv->dv_depth == di->di_curdepth) 2694 break; 2695 } 2696 return dv; 2697 case DEVITER_F_ROOT_FIRST: 2698 while (di->di_curdepth <= di->di_maxdepth) { 2699 if ((dv = deviter_next1(di)) == NULL) { 2700 di->di_curdepth++; 2701 deviter_reinit(di); 2702 } else if (dv->dv_depth == di->di_curdepth) 2703 break; 2704 } 2705 return dv; 2706 default: 2707 return NULL; 2708 } 2709 } 2710 2711 void 2712 deviter_release(deviter_t *di) 2713 { 2714 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 2715 2716 mutex_enter(&alldevs_mtx); 2717 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 2718 --alldevs_nwrite; 2719 else { 2720 2721 if (rw) { 2722 if (--alldevs_nwrite == 0) 2723 alldevs_writer = NULL; 2724 } else 2725 --alldevs_nread; 2726 2727 cv_signal(&alldevs_cv); 2728 } 2729 mutex_exit(&alldevs_mtx); 2730 } 2731
Indexes created Mon Sep 29 21:09:56 GMT 2025