subr_autoconf.c revision 1.150
1 /* $NetBSD: subr_autoconf.c,v 1.150 2008/05/25 15:03:01 jmcneill 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 1.150 2008/05/25 15:03:01 jmcneill 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/systm.h> 92 #include <sys/kernel.h> 93 #include <sys/errno.h> 94 #include <sys/proc.h> 95 #include <sys/reboot.h> 96 #include <sys/kthread.h> 97 #include <sys/buf.h> 98 #include <sys/dirent.h> 99 #include <sys/vnode.h> 100 #include <sys/mount.h> 101 #include <sys/namei.h> 102 #include <sys/unistd.h> 103 #include <sys/fcntl.h> 104 #include <sys/lockf.h> 105 #include <sys/callout.h> 106 #include <sys/mutex.h> 107 #include <sys/condvar.h> 108 #include <sys/devmon.h> 109 110 #include <sys/disk.h> 111 112 #include <machine/limits.h> 113 114 #include "opt_userconf.h" 115 #ifdef USERCONF 116 #include <sys/userconf.h> 117 #endif 118 119 #ifdef __i386__ 120 #include "opt_splash.h" 121 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 122 #include <dev/splash/splash.h> 123 extern struct splash_progress *splash_progress_state; 124 #endif 125 #endif 126 127 /* 128 * Autoconfiguration subroutines. 129 */ 130 131 typedef struct pmf_private { 132 int pp_nwait; 133 int pp_nlock; 134 lwp_t *pp_holder; 135 kmutex_t pp_mtx; 136 kcondvar_t pp_cv; 137 } pmf_private_t; 138 139 /* 140 * ioconf.c exports exactly two names: cfdata and cfroots. All system 141 * devices and drivers are found via these tables. 142 */ 143 extern struct cfdata cfdata[]; 144 extern const short cfroots[]; 145 146 /* 147 * List of all cfdriver structures. We use this to detect duplicates 148 * when other cfdrivers are loaded. 149 */ 150 struct cfdriverlist allcfdrivers = LIST_HEAD_INITIALIZER(&allcfdrivers); 151 extern struct cfdriver * const cfdriver_list_initial[]; 152 153 /* 154 * Initial list of cfattach's. 155 */ 156 extern const struct cfattachinit cfattachinit[]; 157 158 /* 159 * List of cfdata tables. We always have one such list -- the one 160 * built statically when the kernel was configured. 161 */ 162 struct cftablelist allcftables = TAILQ_HEAD_INITIALIZER(allcftables); 163 static struct cftable initcftable; 164 165 #define ROOT ((device_t)NULL) 166 167 struct matchinfo { 168 cfsubmatch_t fn; 169 struct device *parent; 170 const int *locs; 171 void *aux; 172 struct cfdata *match; 173 int pri; 174 }; 175 176 static char *number(char *, int); 177 static void mapply(struct matchinfo *, cfdata_t); 178 static device_t config_devalloc(const device_t, const cfdata_t, const int *); 179 static void config_devdealloc(device_t); 180 static void config_makeroom(int, struct cfdriver *); 181 static void config_devlink(device_t); 182 static void config_devunlink(device_t); 183 184 static void pmflock_debug(device_t, const char *, int); 185 static void pmflock_debug_with_flags(device_t, const char *, int PMF_FN_PROTO); 186 187 static device_t deviter_next1(deviter_t *); 188 static void deviter_reinit(deviter_t *); 189 190 struct deferred_config { 191 TAILQ_ENTRY(deferred_config) dc_queue; 192 device_t dc_dev; 193 void (*dc_func)(device_t); 194 }; 195 196 TAILQ_HEAD(deferred_config_head, deferred_config); 197 198 struct deferred_config_head deferred_config_queue = 199 TAILQ_HEAD_INITIALIZER(deferred_config_queue); 200 struct deferred_config_head interrupt_config_queue = 201 TAILQ_HEAD_INITIALIZER(interrupt_config_queue); 202 int interrupt_config_threads = 8; 203 204 static void config_process_deferred(struct deferred_config_head *, device_t); 205 206 /* Hooks to finalize configuration once all real devices have been found. */ 207 struct finalize_hook { 208 TAILQ_ENTRY(finalize_hook) f_list; 209 int (*f_func)(device_t); 210 device_t f_dev; 211 }; 212 static TAILQ_HEAD(, finalize_hook) config_finalize_list = 213 TAILQ_HEAD_INITIALIZER(config_finalize_list); 214 static int config_finalize_done; 215 216 /* list of all devices */ 217 struct devicelist alldevs = TAILQ_HEAD_INITIALIZER(alldevs); 218 kcondvar_t alldevs_cv; 219 kmutex_t alldevs_mtx; 220 static int alldevs_nread = 0; 221 static int alldevs_nwrite = 0; 222 static lwp_t *alldevs_writer = NULL; 223 224 volatile int config_pending; /* semaphore for mountroot */ 225 226 #define STREQ(s1, s2) \ 227 (*(s1) == *(s2) && strcmp((s1), (s2)) == 0) 228 229 static int config_initialized; /* config_init() has been called. */ 230 231 static int config_do_twiddle; 232 233 MALLOC_DEFINE(M_PMFPRIV, "pmfpriv", "device pmf private storage"); 234 235 struct vnode * 236 opendisk(struct device *dv) 237 { 238 int bmajor, bminor; 239 struct vnode *tmpvn; 240 int error; 241 dev_t dev; 242 243 /* 244 * Lookup major number for disk block device. 245 */ 246 bmajor = devsw_name2blk(device_xname(dv), NULL, 0); 247 if (bmajor == -1) 248 return NULL; 249 250 bminor = minor(device_unit(dv)); 251 /* 252 * Fake a temporary vnode for the disk, open it, and read 253 * and hash the sectors. 254 */ 255 dev = device_is_a(dv, "dk") ? makedev(bmajor, bminor) : 256 MAKEDISKDEV(bmajor, bminor, RAW_PART); 257 if (bdevvp(dev, &tmpvn)) 258 panic("%s: can't alloc vnode for %s", __func__, 259 device_xname(dv)); 260 error = VOP_OPEN(tmpvn, FREAD, NOCRED); 261 if (error) { 262 #ifndef DEBUG 263 /* 264 * Ignore errors caused by missing device, partition, 265 * or medium. 266 */ 267 if (error != ENXIO && error != ENODEV) 268 #endif 269 printf("%s: can't open dev %s (%d)\n", 270 __func__, device_xname(dv), error); 271 vput(tmpvn); 272 return NULL; 273 } 274 275 return tmpvn; 276 } 277 278 int 279 config_handle_wedges(struct device *dv, int par) 280 { 281 struct dkwedge_list wl; 282 struct dkwedge_info *wi; 283 struct vnode *vn; 284 char diskname[16]; 285 int i, error; 286 287 if ((vn = opendisk(dv)) == NULL) 288 return -1; 289 290 wl.dkwl_bufsize = sizeof(*wi) * 16; 291 wl.dkwl_buf = wi = malloc(wl.dkwl_bufsize, M_TEMP, M_WAITOK); 292 293 error = VOP_IOCTL(vn, DIOCLWEDGES, &wl, FREAD, NOCRED); 294 VOP_CLOSE(vn, FREAD, NOCRED); 295 vput(vn); 296 if (error) { 297 #ifdef DEBUG_WEDGE 298 printf("%s: List wedges returned %d\n", 299 device_xname(dv), error); 300 #endif 301 free(wi, M_TEMP); 302 return -1; 303 } 304 305 #ifdef DEBUG_WEDGE 306 printf("%s: Returned %u(%u) wedges\n", device_xname(dv), 307 wl.dkwl_nwedges, wl.dkwl_ncopied); 308 #endif 309 snprintf(diskname, sizeof(diskname), "%s%c", device_xname(dv), 310 par + 'a'); 311 312 for (i = 0; i < wl.dkwl_ncopied; i++) { 313 #ifdef DEBUG_WEDGE 314 printf("%s: Looking for %s in %s\n", 315 device_xname(dv), diskname, wi[i].dkw_wname); 316 #endif 317 if (strcmp(wi[i].dkw_wname, diskname) == 0) 318 break; 319 } 320 321 if (i == wl.dkwl_ncopied) { 322 #ifdef DEBUG_WEDGE 323 printf("%s: Cannot find wedge with parent %s\n", 324 device_xname(dv), diskname); 325 #endif 326 free(wi, M_TEMP); 327 return -1; 328 } 329 330 #ifdef DEBUG_WEDGE 331 printf("%s: Setting boot wedge %s (%s) at %llu %llu\n", 332 device_xname(dv), wi[i].dkw_devname, wi[i].dkw_wname, 333 (unsigned long long)wi[i].dkw_offset, 334 (unsigned long long)wi[i].dkw_size); 335 #endif 336 dkwedge_set_bootwedge(dv, wi[i].dkw_offset, wi[i].dkw_size); 337 free(wi, M_TEMP); 338 return 0; 339 } 340 341 /* 342 * Initialize the autoconfiguration data structures. Normally this 343 * is done by configure(), but some platforms need to do this very 344 * early (to e.g. initialize the console). 345 */ 346 void 347 config_init(void) 348 { 349 const struct cfattachinit *cfai; 350 int i, j; 351 352 if (config_initialized) 353 return; 354 355 mutex_init(&alldevs_mtx, MUTEX_DEFAULT, IPL_NONE); 356 cv_init(&alldevs_cv, "alldevs"); 357 358 /* allcfdrivers is statically initialized. */ 359 for (i = 0; cfdriver_list_initial[i] != NULL; i++) { 360 if (config_cfdriver_attach(cfdriver_list_initial[i]) != 0) 361 panic("configure: duplicate `%s' drivers", 362 cfdriver_list_initial[i]->cd_name); 363 } 364 365 for (cfai = &cfattachinit[0]; cfai->cfai_name != NULL; cfai++) { 366 for (j = 0; cfai->cfai_list[j] != NULL; j++) { 367 if (config_cfattach_attach(cfai->cfai_name, 368 cfai->cfai_list[j]) != 0) 369 panic("configure: duplicate `%s' attachment " 370 "of `%s' driver", 371 cfai->cfai_list[j]->ca_name, 372 cfai->cfai_name); 373 } 374 } 375 376 initcftable.ct_cfdata = cfdata; 377 TAILQ_INSERT_TAIL(&allcftables, &initcftable, ct_list); 378 379 config_initialized = 1; 380 } 381 382 void 383 config_deferred(device_t dev) 384 { 385 config_process_deferred(&deferred_config_queue, dev); 386 config_process_deferred(&interrupt_config_queue, dev); 387 } 388 389 static void 390 config_interrupts_thread(void *cookie) 391 { 392 struct deferred_config *dc; 393 394 while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) { 395 TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue); 396 (*dc->dc_func)(dc->dc_dev); 397 free(dc, M_DEVBUF); 398 config_pending_decr(); 399 } 400 kthread_exit(0); 401 } 402 403 /* 404 * Configure the system's hardware. 405 */ 406 void 407 configure(void) 408 { 409 extern void ssp_init(void); 410 int i, s; 411 412 /* Initialize data structures. */ 413 config_init(); 414 pmf_init(); 415 #if NDRVCTL > 0 416 drvctl_init(); 417 #endif 418 419 #ifdef USERCONF 420 if (boothowto & RB_USERCONF) 421 user_config(); 422 #endif 423 424 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 425 config_do_twiddle = 1; 426 printf_nolog("Detecting hardware..."); 427 } 428 429 /* 430 * Do the machine-dependent portion of autoconfiguration. This 431 * sets the configuration machinery here in motion by "finding" 432 * the root bus. When this function returns, we expect interrupts 433 * to be enabled. 434 */ 435 cpu_configure(); 436 437 /* Initialize SSP. */ 438 ssp_init(); 439 440 /* 441 * Now that we've found all the hardware, start the real time 442 * and statistics clocks. 443 */ 444 initclocks(); 445 446 cold = 0; /* clocks are running, we're warm now! */ 447 s = splsched(); 448 curcpu()->ci_schedstate.spc_flags |= SPCF_RUNNING; 449 splx(s); 450 451 /* Boot the secondary processors. */ 452 mp_online = true; 453 #if defined(MULTIPROCESSOR) 454 cpu_boot_secondary_processors(); 455 #endif 456 457 /* Setup the runqueues and scheduler. */ 458 runq_init(); 459 sched_init(); 460 461 /* 462 * Create threads to call back and finish configuration for 463 * devices that want interrupts enabled. 464 */ 465 for (i = 0; i < interrupt_config_threads; i++) { 466 (void)kthread_create(PRI_NONE, 0, NULL, 467 config_interrupts_thread, NULL, NULL, "config"); 468 } 469 470 /* Get the threads going and into any sleeps before continuing. */ 471 yield(); 472 473 /* Lock the kernel on behalf of lwp0. */ 474 KERNEL_LOCK(1, NULL); 475 } 476 477 /* 478 * Announce device attach/detach to userland listeners. 479 */ 480 static void 481 devmon_report_device(device_t dev, bool isattach) 482 { 483 #if NDRVCTL > 0 484 prop_dictionary_t ev; 485 const char *parent; 486 const char *what; 487 device_t pdev = device_parent(dev); 488 489 ev = prop_dictionary_create(); 490 if (ev == NULL) 491 return; 492 493 what = (isattach ? "device-attach" : "device-detach"); 494 parent = (pdev == NULL ? "root" : device_xname(pdev)); 495 if (!prop_dictionary_set_cstring(ev, "device", device_xname(dev)) || 496 !prop_dictionary_set_cstring(ev, "parent", parent)) { 497 prop_object_release(ev); 498 return; 499 } 500 501 devmon_insert(what, ev); 502 #endif 503 } 504 505 /* 506 * Add a cfdriver to the system. 507 */ 508 int 509 config_cfdriver_attach(struct cfdriver *cd) 510 { 511 struct cfdriver *lcd; 512 513 /* Make sure this driver isn't already in the system. */ 514 LIST_FOREACH(lcd, &allcfdrivers, cd_list) { 515 if (STREQ(lcd->cd_name, cd->cd_name)) 516 return (EEXIST); 517 } 518 519 LIST_INIT(&cd->cd_attach); 520 LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list); 521 522 return (0); 523 } 524 525 /* 526 * Remove a cfdriver from the system. 527 */ 528 int 529 config_cfdriver_detach(struct cfdriver *cd) 530 { 531 int i; 532 533 /* Make sure there are no active instances. */ 534 for (i = 0; i < cd->cd_ndevs; i++) { 535 if (cd->cd_devs[i] != NULL) 536 return (EBUSY); 537 } 538 539 /* ...and no attachments loaded. */ 540 if (LIST_EMPTY(&cd->cd_attach) == 0) 541 return (EBUSY); 542 543 LIST_REMOVE(cd, cd_list); 544 545 KASSERT(cd->cd_devs == NULL); 546 547 return (0); 548 } 549 550 /* 551 * Look up a cfdriver by name. 552 */ 553 struct cfdriver * 554 config_cfdriver_lookup(const char *name) 555 { 556 struct cfdriver *cd; 557 558 LIST_FOREACH(cd, &allcfdrivers, cd_list) { 559 if (STREQ(cd->cd_name, name)) 560 return (cd); 561 } 562 563 return (NULL); 564 } 565 566 /* 567 * Add a cfattach to the specified driver. 568 */ 569 int 570 config_cfattach_attach(const char *driver, struct cfattach *ca) 571 { 572 struct cfattach *lca; 573 struct cfdriver *cd; 574 575 cd = config_cfdriver_lookup(driver); 576 if (cd == NULL) 577 return (ESRCH); 578 579 /* Make sure this attachment isn't already on this driver. */ 580 LIST_FOREACH(lca, &cd->cd_attach, ca_list) { 581 if (STREQ(lca->ca_name, ca->ca_name)) 582 return (EEXIST); 583 } 584 585 LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list); 586 587 return (0); 588 } 589 590 /* 591 * Remove a cfattach from the specified driver. 592 */ 593 int 594 config_cfattach_detach(const char *driver, struct cfattach *ca) 595 { 596 struct cfdriver *cd; 597 device_t dev; 598 int i; 599 600 cd = config_cfdriver_lookup(driver); 601 if (cd == NULL) 602 return (ESRCH); 603 604 /* Make sure there are no active instances. */ 605 for (i = 0; i < cd->cd_ndevs; i++) { 606 if ((dev = cd->cd_devs[i]) == NULL) 607 continue; 608 if (dev->dv_cfattach == ca) 609 return (EBUSY); 610 } 611 612 LIST_REMOVE(ca, ca_list); 613 614 return (0); 615 } 616 617 /* 618 * Look up a cfattach by name. 619 */ 620 static struct cfattach * 621 config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname) 622 { 623 struct cfattach *ca; 624 625 LIST_FOREACH(ca, &cd->cd_attach, ca_list) { 626 if (STREQ(ca->ca_name, atname)) 627 return (ca); 628 } 629 630 return (NULL); 631 } 632 633 /* 634 * Look up a cfattach by driver/attachment name. 635 */ 636 struct cfattach * 637 config_cfattach_lookup(const char *name, const char *atname) 638 { 639 struct cfdriver *cd; 640 641 cd = config_cfdriver_lookup(name); 642 if (cd == NULL) 643 return (NULL); 644 645 return (config_cfattach_lookup_cd(cd, atname)); 646 } 647 648 /* 649 * Apply the matching function and choose the best. This is used 650 * a few times and we want to keep the code small. 651 */ 652 static void 653 mapply(struct matchinfo *m, cfdata_t cf) 654 { 655 int pri; 656 657 if (m->fn != NULL) { 658 pri = (*m->fn)(m->parent, cf, m->locs, m->aux); 659 } else { 660 pri = config_match(m->parent, cf, m->aux); 661 } 662 if (pri > m->pri) { 663 m->match = cf; 664 m->pri = pri; 665 } 666 } 667 668 int 669 config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux) 670 { 671 const struct cfiattrdata *ci; 672 const struct cflocdesc *cl; 673 int nlocs, i; 674 675 ci = cfiattr_lookup(cf->cf_pspec->cfp_iattr, parent->dv_cfdriver); 676 KASSERT(ci); 677 nlocs = ci->ci_loclen; 678 for (i = 0; i < nlocs; i++) { 679 cl = &ci->ci_locdesc[i]; 680 /* !cld_defaultstr means no default value */ 681 if ((!(cl->cld_defaultstr) 682 || (cf->cf_loc[i] != cl->cld_default)) 683 && cf->cf_loc[i] != locs[i]) 684 return (0); 685 } 686 687 return (config_match(parent, cf, aux)); 688 } 689 690 /* 691 * Helper function: check whether the driver supports the interface attribute 692 * and return its descriptor structure. 693 */ 694 static const struct cfiattrdata * 695 cfdriver_get_iattr(const struct cfdriver *cd, const char *ia) 696 { 697 const struct cfiattrdata * const *cpp; 698 699 if (cd->cd_attrs == NULL) 700 return (0); 701 702 for (cpp = cd->cd_attrs; *cpp; cpp++) { 703 if (STREQ((*cpp)->ci_name, ia)) { 704 /* Match. */ 705 return (*cpp); 706 } 707 } 708 return (0); 709 } 710 711 /* 712 * Lookup an interface attribute description by name. 713 * If the driver is given, consider only its supported attributes. 714 */ 715 const struct cfiattrdata * 716 cfiattr_lookup(const char *name, const struct cfdriver *cd) 717 { 718 const struct cfdriver *d; 719 const struct cfiattrdata *ia; 720 721 if (cd) 722 return (cfdriver_get_iattr(cd, name)); 723 724 LIST_FOREACH(d, &allcfdrivers, cd_list) { 725 ia = cfdriver_get_iattr(d, name); 726 if (ia) 727 return (ia); 728 } 729 return (0); 730 } 731 732 /* 733 * Determine if `parent' is a potential parent for a device spec based 734 * on `cfp'. 735 */ 736 static int 737 cfparent_match(const device_t parent, const struct cfparent *cfp) 738 { 739 struct cfdriver *pcd; 740 741 /* We don't match root nodes here. */ 742 if (cfp == NULL) 743 return (0); 744 745 pcd = parent->dv_cfdriver; 746 KASSERT(pcd != NULL); 747 748 /* 749 * First, ensure this parent has the correct interface 750 * attribute. 751 */ 752 if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr)) 753 return (0); 754 755 /* 756 * If no specific parent device instance was specified (i.e. 757 * we're attaching to the attribute only), we're done! 758 */ 759 if (cfp->cfp_parent == NULL) 760 return (1); 761 762 /* 763 * Check the parent device's name. 764 */ 765 if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0) 766 return (0); /* not the same parent */ 767 768 /* 769 * Make sure the unit number matches. 770 */ 771 if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */ 772 cfp->cfp_unit == parent->dv_unit) 773 return (1); 774 775 /* Unit numbers don't match. */ 776 return (0); 777 } 778 779 /* 780 * Helper for config_cfdata_attach(): check all devices whether it could be 781 * parent any attachment in the config data table passed, and rescan. 782 */ 783 static void 784 rescan_with_cfdata(const struct cfdata *cf) 785 { 786 device_t d; 787 const struct cfdata *cf1; 788 deviter_t di; 789 790 791 /* 792 * "alldevs" is likely longer than an LKM's cfdata, so make it 793 * the outer loop. 794 */ 795 for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) { 796 797 if (!(d->dv_cfattach->ca_rescan)) 798 continue; 799 800 for (cf1 = cf; cf1->cf_name; cf1++) { 801 802 if (!cfparent_match(d, cf1->cf_pspec)) 803 continue; 804 805 (*d->dv_cfattach->ca_rescan)(d, 806 cf1->cf_pspec->cfp_iattr, cf1->cf_loc); 807 } 808 } 809 deviter_release(&di); 810 } 811 812 /* 813 * Attach a supplemental config data table and rescan potential 814 * parent devices if required. 815 */ 816 int 817 config_cfdata_attach(cfdata_t cf, int scannow) 818 { 819 struct cftable *ct; 820 821 ct = malloc(sizeof(struct cftable), M_DEVBUF, M_WAITOK); 822 ct->ct_cfdata = cf; 823 TAILQ_INSERT_TAIL(&allcftables, ct, ct_list); 824 825 if (scannow) 826 rescan_with_cfdata(cf); 827 828 return (0); 829 } 830 831 /* 832 * Helper for config_cfdata_detach: check whether a device is 833 * found through any attachment in the config data table. 834 */ 835 static int 836 dev_in_cfdata(const struct device *d, const struct cfdata *cf) 837 { 838 const struct cfdata *cf1; 839 840 for (cf1 = cf; cf1->cf_name; cf1++) 841 if (d->dv_cfdata == cf1) 842 return (1); 843 844 return (0); 845 } 846 847 /* 848 * Detach a supplemental config data table. Detach all devices found 849 * through that table (and thus keeping references to it) before. 850 */ 851 int 852 config_cfdata_detach(cfdata_t cf) 853 { 854 device_t d; 855 int error = 0; 856 struct cftable *ct; 857 deviter_t di; 858 859 for (d = deviter_first(&di, DEVITER_F_RW); d != NULL; 860 d = deviter_next(&di)) { 861 if (!dev_in_cfdata(d, cf)) 862 continue; 863 if ((error = config_detach(d, 0)) != 0) 864 break; 865 } 866 deviter_release(&di); 867 if (error) { 868 aprint_error_dev(d, "unable to detach instance\n"); 869 return error; 870 } 871 872 TAILQ_FOREACH(ct, &allcftables, ct_list) { 873 if (ct->ct_cfdata == cf) { 874 TAILQ_REMOVE(&allcftables, ct, ct_list); 875 free(ct, M_DEVBUF); 876 return (0); 877 } 878 } 879 880 /* not found -- shouldn't happen */ 881 return (EINVAL); 882 } 883 884 /* 885 * Invoke the "match" routine for a cfdata entry on behalf of 886 * an external caller, usually a "submatch" routine. 887 */ 888 int 889 config_match(device_t parent, cfdata_t cf, void *aux) 890 { 891 struct cfattach *ca; 892 893 ca = config_cfattach_lookup(cf->cf_name, cf->cf_atname); 894 if (ca == NULL) { 895 /* No attachment for this entry, oh well. */ 896 return (0); 897 } 898 899 return ((*ca->ca_match)(parent, cf, aux)); 900 } 901 902 /* 903 * Iterate over all potential children of some device, calling the given 904 * function (default being the child's match function) for each one. 905 * Nonzero returns are matches; the highest value returned is considered 906 * the best match. Return the `found child' if we got a match, or NULL 907 * otherwise. The `aux' pointer is simply passed on through. 908 * 909 * Note that this function is designed so that it can be used to apply 910 * an arbitrary function to all potential children (its return value 911 * can be ignored). 912 */ 913 cfdata_t 914 config_search_loc(cfsubmatch_t fn, device_t parent, 915 const char *ifattr, const int *locs, void *aux) 916 { 917 struct cftable *ct; 918 cfdata_t cf; 919 struct matchinfo m; 920 921 KASSERT(config_initialized); 922 KASSERT(!ifattr || cfdriver_get_iattr(parent->dv_cfdriver, ifattr)); 923 924 m.fn = fn; 925 m.parent = parent; 926 m.locs = locs; 927 m.aux = aux; 928 m.match = NULL; 929 m.pri = 0; 930 931 TAILQ_FOREACH(ct, &allcftables, ct_list) { 932 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 933 934 /* We don't match root nodes here. */ 935 if (!cf->cf_pspec) 936 continue; 937 938 /* 939 * Skip cf if no longer eligible, otherwise scan 940 * through parents for one matching `parent', and 941 * try match function. 942 */ 943 if (cf->cf_fstate == FSTATE_FOUND) 944 continue; 945 if (cf->cf_fstate == FSTATE_DNOTFOUND || 946 cf->cf_fstate == FSTATE_DSTAR) 947 continue; 948 949 /* 950 * If an interface attribute was specified, 951 * consider only children which attach to 952 * that attribute. 953 */ 954 if (ifattr && !STREQ(ifattr, cf->cf_pspec->cfp_iattr)) 955 continue; 956 957 if (cfparent_match(parent, cf->cf_pspec)) 958 mapply(&m, cf); 959 } 960 } 961 return (m.match); 962 } 963 964 cfdata_t 965 config_search_ia(cfsubmatch_t fn, device_t parent, const char *ifattr, 966 void *aux) 967 { 968 969 return (config_search_loc(fn, parent, ifattr, NULL, aux)); 970 } 971 972 /* 973 * Find the given root device. 974 * This is much like config_search, but there is no parent. 975 * Don't bother with multiple cfdata tables; the root node 976 * must always be in the initial table. 977 */ 978 cfdata_t 979 config_rootsearch(cfsubmatch_t fn, const char *rootname, void *aux) 980 { 981 cfdata_t cf; 982 const short *p; 983 struct matchinfo m; 984 985 m.fn = fn; 986 m.parent = ROOT; 987 m.aux = aux; 988 m.match = NULL; 989 m.pri = 0; 990 m.locs = 0; 991 /* 992 * Look at root entries for matching name. We do not bother 993 * with found-state here since only one root should ever be 994 * searched (and it must be done first). 995 */ 996 for (p = cfroots; *p >= 0; p++) { 997 cf = &cfdata[*p]; 998 if (strcmp(cf->cf_name, rootname) == 0) 999 mapply(&m, cf); 1000 } 1001 return (m.match); 1002 } 1003 1004 static const char * const msgs[3] = { "", " not configured\n", " unsupported\n" }; 1005 1006 /* 1007 * The given `aux' argument describes a device that has been found 1008 * on the given parent, but not necessarily configured. Locate the 1009 * configuration data for that device (using the submatch function 1010 * provided, or using candidates' cd_match configuration driver 1011 * functions) and attach it, and return true. If the device was 1012 * not configured, call the given `print' function and return 0. 1013 */ 1014 device_t 1015 config_found_sm_loc(device_t parent, 1016 const char *ifattr, const int *locs, void *aux, 1017 cfprint_t print, cfsubmatch_t submatch) 1018 { 1019 cfdata_t cf; 1020 1021 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1022 if (splash_progress_state) 1023 splash_progress_update(splash_progress_state); 1024 #endif 1025 1026 if ((cf = config_search_loc(submatch, parent, ifattr, locs, aux))) 1027 return(config_attach_loc(parent, cf, locs, aux, print)); 1028 if (print) { 1029 if (config_do_twiddle) 1030 twiddle(); 1031 aprint_normal("%s", msgs[(*print)(aux, device_xname(parent))]); 1032 } 1033 1034 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1035 if (splash_progress_state) 1036 splash_progress_update(splash_progress_state); 1037 #endif 1038 1039 return (NULL); 1040 } 1041 1042 device_t 1043 config_found_ia(device_t parent, const char *ifattr, void *aux, 1044 cfprint_t print) 1045 { 1046 1047 return (config_found_sm_loc(parent, ifattr, NULL, aux, print, NULL)); 1048 } 1049 1050 device_t 1051 config_found(device_t parent, void *aux, cfprint_t print) 1052 { 1053 1054 return (config_found_sm_loc(parent, NULL, NULL, aux, print, NULL)); 1055 } 1056 1057 /* 1058 * As above, but for root devices. 1059 */ 1060 device_t 1061 config_rootfound(const char *rootname, void *aux) 1062 { 1063 cfdata_t cf; 1064 1065 if ((cf = config_rootsearch((cfsubmatch_t)NULL, rootname, aux)) != NULL) 1066 return (config_attach(ROOT, cf, aux, (cfprint_t)NULL)); 1067 aprint_error("root device %s not configured\n", rootname); 1068 return (NULL); 1069 } 1070 1071 /* just like sprintf(buf, "%d") except that it works from the end */ 1072 static char * 1073 number(char *ep, int n) 1074 { 1075 1076 *--ep = 0; 1077 while (n >= 10) { 1078 *--ep = (n % 10) + '0'; 1079 n /= 10; 1080 } 1081 *--ep = n + '0'; 1082 return (ep); 1083 } 1084 1085 /* 1086 * Expand the size of the cd_devs array if necessary. 1087 */ 1088 static void 1089 config_makeroom(int n, struct cfdriver *cd) 1090 { 1091 int old, new; 1092 void **nsp; 1093 1094 if (n < cd->cd_ndevs) 1095 return; 1096 1097 /* 1098 * Need to expand the array. 1099 */ 1100 old = cd->cd_ndevs; 1101 if (old == 0) 1102 new = 4; 1103 else 1104 new = old * 2; 1105 while (new <= n) 1106 new *= 2; 1107 cd->cd_ndevs = new; 1108 nsp = malloc(new * sizeof(void *), M_DEVBUF, 1109 cold ? M_NOWAIT : M_WAITOK); 1110 if (nsp == NULL) 1111 panic("config_attach: %sing dev array", 1112 old != 0 ? "expand" : "creat"); 1113 memset(nsp + old, 0, (new - old) * sizeof(void *)); 1114 if (old != 0) { 1115 memcpy(nsp, cd->cd_devs, old * sizeof(void *)); 1116 free(cd->cd_devs, M_DEVBUF); 1117 } 1118 cd->cd_devs = nsp; 1119 } 1120 1121 static void 1122 config_devlink(device_t dev) 1123 { 1124 struct cfdriver *cd = dev->dv_cfdriver; 1125 1126 /* put this device in the devices array */ 1127 config_makeroom(dev->dv_unit, cd); 1128 if (cd->cd_devs[dev->dv_unit]) 1129 panic("config_attach: duplicate %s", device_xname(dev)); 1130 cd->cd_devs[dev->dv_unit] = dev; 1131 1132 /* It is safe to add a device to the tail of the list while 1133 * readers are in the list, but not while a writer is in 1134 * the list. Wait for any writer to complete. 1135 */ 1136 mutex_enter(&alldevs_mtx); 1137 while (alldevs_nwrite != 0 && alldevs_writer != curlwp) 1138 cv_wait(&alldevs_cv, &alldevs_mtx); 1139 TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); /* link up */ 1140 cv_signal(&alldevs_cv); 1141 mutex_exit(&alldevs_mtx); 1142 } 1143 1144 static void 1145 config_devunlink(device_t dev) 1146 { 1147 struct cfdriver *cd = dev->dv_cfdriver; 1148 int i; 1149 1150 /* Unlink from device list. */ 1151 TAILQ_REMOVE(&alldevs, dev, dv_list); 1152 1153 /* Remove from cfdriver's array. */ 1154 cd->cd_devs[dev->dv_unit] = NULL; 1155 1156 /* 1157 * If the device now has no units in use, deallocate its softc array. 1158 */ 1159 for (i = 0; i < cd->cd_ndevs; i++) 1160 if (cd->cd_devs[i] != NULL) 1161 break; 1162 if (i == cd->cd_ndevs) { /* nothing found; deallocate */ 1163 free(cd->cd_devs, M_DEVBUF); 1164 cd->cd_devs = NULL; 1165 cd->cd_ndevs = 0; 1166 } 1167 } 1168 1169 static device_t 1170 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1171 { 1172 struct cfdriver *cd; 1173 struct cfattach *ca; 1174 size_t lname, lunit; 1175 const char *xunit; 1176 int myunit; 1177 char num[10]; 1178 device_t dev; 1179 void *dev_private; 1180 const struct cfiattrdata *ia; 1181 1182 cd = config_cfdriver_lookup(cf->cf_name); 1183 if (cd == NULL) 1184 return (NULL); 1185 1186 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1187 if (ca == NULL) 1188 return (NULL); 1189 1190 if ((ca->ca_flags & DVF_PRIV_ALLOC) == 0 && 1191 ca->ca_devsize < sizeof(struct device)) 1192 panic("config_devalloc: %s", cf->cf_atname); 1193 1194 #ifndef __BROKEN_CONFIG_UNIT_USAGE 1195 if (cf->cf_fstate == FSTATE_STAR) { 1196 for (myunit = cf->cf_unit; myunit < cd->cd_ndevs; myunit++) 1197 if (cd->cd_devs[myunit] == NULL) 1198 break; 1199 /* 1200 * myunit is now the unit of the first NULL device pointer, 1201 * or max(cd->cd_ndevs,cf->cf_unit). 1202 */ 1203 } else { 1204 myunit = cf->cf_unit; 1205 if (myunit < cd->cd_ndevs && cd->cd_devs[myunit] != NULL) 1206 return (NULL); 1207 } 1208 #else 1209 myunit = cf->cf_unit; 1210 #endif /* ! __BROKEN_CONFIG_UNIT_USAGE */ 1211 1212 /* compute length of name and decimal expansion of unit number */ 1213 lname = strlen(cd->cd_name); 1214 xunit = number(&num[sizeof(num)], myunit); 1215 lunit = &num[sizeof(num)] - xunit; 1216 if (lname + lunit > sizeof(dev->dv_xname)) 1217 panic("config_devalloc: device name too long"); 1218 1219 /* get memory for all device vars */ 1220 KASSERT((ca->ca_flags & DVF_PRIV_ALLOC) || ca->ca_devsize >= sizeof(struct device)); 1221 if (ca->ca_devsize > 0) { 1222 dev_private = malloc(ca->ca_devsize, M_DEVBUF, 1223 M_ZERO | (cold ? M_NOWAIT : M_WAITOK)); 1224 if (dev_private == NULL) 1225 panic("config_devalloc: memory allocation for device softc failed"); 1226 } else { 1227 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1228 dev_private = NULL; 1229 } 1230 1231 if ((ca->ca_flags & DVF_PRIV_ALLOC) != 0) { 1232 dev = malloc(sizeof(struct device), M_DEVBUF, 1233 M_ZERO | (cold ? M_NOWAIT : M_WAITOK)); 1234 } else { 1235 dev = dev_private; 1236 } 1237 if (dev == NULL) 1238 panic("config_devalloc: memory allocation for device_t failed"); 1239 1240 dev->dv_class = cd->cd_class; 1241 dev->dv_cfdata = cf; 1242 dev->dv_cfdriver = cd; 1243 dev->dv_cfattach = ca; 1244 dev->dv_unit = myunit; 1245 dev->dv_activity_count = 0; 1246 dev->dv_activity_handlers = NULL; 1247 dev->dv_private = dev_private; 1248 memcpy(dev->dv_xname, cd->cd_name, lname); 1249 memcpy(dev->dv_xname + lname, xunit, lunit); 1250 dev->dv_parent = parent; 1251 if (parent != NULL) 1252 dev->dv_depth = parent->dv_depth + 1; 1253 else 1254 dev->dv_depth = 0; 1255 dev->dv_flags = DVF_ACTIVE; /* always initially active */ 1256 dev->dv_flags |= ca->ca_flags; /* inherit flags from class */ 1257 if (locs) { 1258 KASSERT(parent); /* no locators at root */ 1259 ia = cfiattr_lookup(cf->cf_pspec->cfp_iattr, 1260 parent->dv_cfdriver); 1261 dev->dv_locators = malloc(ia->ci_loclen * sizeof(int), 1262 M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 1263 memcpy(dev->dv_locators, locs, ia->ci_loclen * sizeof(int)); 1264 } 1265 dev->dv_properties = prop_dictionary_create(); 1266 KASSERT(dev->dv_properties != NULL); 1267 1268 prop_dictionary_set_cstring_nocopy(dev->dv_properties, 1269 "device-driver", dev->dv_cfdriver->cd_name); 1270 prop_dictionary_set_uint16(dev->dv_properties, 1271 "device-unit", dev->dv_unit); 1272 1273 return (dev); 1274 } 1275 1276 static void 1277 config_devdealloc(device_t dev) 1278 { 1279 1280 KASSERT(dev->dv_properties != NULL); 1281 prop_object_release(dev->dv_properties); 1282 1283 if (dev->dv_activity_handlers) 1284 panic("config_devdealloc with registered handlers"); 1285 1286 if (dev->dv_locators) 1287 free(dev->dv_locators, M_DEVBUF); 1288 1289 if ((dev->dv_flags & DVF_PRIV_ALLOC) != 0 && dev->dv_private != NULL) 1290 free(dev->dv_private, M_DEVBUF); 1291 1292 free(dev, M_DEVBUF); 1293 } 1294 1295 /* 1296 * Attach a found device. 1297 */ 1298 device_t 1299 config_attach_loc(device_t parent, cfdata_t cf, 1300 const int *locs, void *aux, cfprint_t print) 1301 { 1302 device_t dev; 1303 struct cftable *ct; 1304 const char *drvname; 1305 1306 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1307 if (splash_progress_state) 1308 splash_progress_update(splash_progress_state); 1309 #endif 1310 1311 dev = config_devalloc(parent, cf, locs); 1312 if (!dev) 1313 panic("config_attach: allocation of device softc failed"); 1314 1315 /* XXX redundant - see below? */ 1316 if (cf->cf_fstate != FSTATE_STAR) { 1317 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1318 cf->cf_fstate = FSTATE_FOUND; 1319 } 1320 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1321 else 1322 cf->cf_unit++; 1323 #endif 1324 1325 config_devlink(dev); 1326 1327 if (config_do_twiddle) 1328 twiddle(); 1329 else 1330 aprint_naive("Found "); 1331 /* 1332 * We want the next two printfs for normal, verbose, and quiet, 1333 * but not silent (in which case, we're twiddling, instead). 1334 */ 1335 if (parent == ROOT) { 1336 aprint_naive("%s (root)", device_xname(dev)); 1337 aprint_normal("%s (root)", device_xname(dev)); 1338 } else { 1339 aprint_naive("%s at %s", device_xname(dev), device_xname(parent)); 1340 aprint_normal("%s at %s", device_xname(dev), device_xname(parent)); 1341 if (print) 1342 (void) (*print)(aux, NULL); 1343 } 1344 1345 /* 1346 * Before attaching, clobber any unfound devices that are 1347 * otherwise identical. 1348 * XXX code above is redundant? 1349 */ 1350 drvname = dev->dv_cfdriver->cd_name; 1351 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1352 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1353 if (STREQ(cf->cf_name, drvname) && 1354 cf->cf_unit == dev->dv_unit) { 1355 if (cf->cf_fstate == FSTATE_NOTFOUND) 1356 cf->cf_fstate = FSTATE_FOUND; 1357 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1358 /* 1359 * Bump the unit number on all starred cfdata 1360 * entries for this device. 1361 */ 1362 if (cf->cf_fstate == FSTATE_STAR) 1363 cf->cf_unit++; 1364 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 1365 } 1366 } 1367 } 1368 #ifdef __HAVE_DEVICE_REGISTER 1369 device_register(dev, aux); 1370 #endif 1371 1372 /* Let userland know */ 1373 devmon_report_device(dev, true); 1374 1375 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1376 if (splash_progress_state) 1377 splash_progress_update(splash_progress_state); 1378 #endif 1379 (*dev->dv_cfattach->ca_attach)(parent, dev, aux); 1380 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1381 if (splash_progress_state) 1382 splash_progress_update(splash_progress_state); 1383 #endif 1384 1385 if (!device_pmf_is_registered(dev)) 1386 aprint_debug_dev(dev, "WARNING: power management not supported\n"); 1387 1388 config_process_deferred(&deferred_config_queue, dev); 1389 return (dev); 1390 } 1391 1392 device_t 1393 config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print) 1394 { 1395 1396 return (config_attach_loc(parent, cf, NULL, aux, print)); 1397 } 1398 1399 /* 1400 * As above, but for pseudo-devices. Pseudo-devices attached in this 1401 * way are silently inserted into the device tree, and their children 1402 * attached. 1403 * 1404 * Note that because pseudo-devices are attached silently, any information 1405 * the attach routine wishes to print should be prefixed with the device 1406 * name by the attach routine. 1407 */ 1408 device_t 1409 config_attach_pseudo(cfdata_t cf) 1410 { 1411 device_t dev; 1412 1413 dev = config_devalloc(ROOT, cf, NULL); 1414 if (!dev) 1415 return (NULL); 1416 1417 /* XXX mark busy in cfdata */ 1418 1419 config_devlink(dev); 1420 1421 #if 0 /* XXXJRT not yet */ 1422 #ifdef __HAVE_DEVICE_REGISTER 1423 device_register(dev, NULL); /* like a root node */ 1424 #endif 1425 #endif 1426 (*dev->dv_cfattach->ca_attach)(ROOT, dev, NULL); 1427 config_process_deferred(&deferred_config_queue, dev); 1428 return (dev); 1429 } 1430 1431 /* 1432 * Detach a device. Optionally forced (e.g. because of hardware 1433 * removal) and quiet. Returns zero if successful, non-zero 1434 * (an error code) otherwise. 1435 * 1436 * Note that this code wants to be run from a process context, so 1437 * that the detach can sleep to allow processes which have a device 1438 * open to run and unwind their stacks. 1439 */ 1440 int 1441 config_detach(device_t dev, int flags) 1442 { 1443 struct cftable *ct; 1444 cfdata_t cf; 1445 const struct cfattach *ca; 1446 struct cfdriver *cd; 1447 #ifdef DIAGNOSTIC 1448 device_t d; 1449 #endif 1450 int rv = 0; 1451 1452 #ifdef DIAGNOSTIC 1453 if (dev->dv_cfdata != NULL && 1454 dev->dv_cfdata->cf_fstate != FSTATE_FOUND && 1455 dev->dv_cfdata->cf_fstate != FSTATE_STAR) 1456 panic("config_detach: bad device fstate"); 1457 #endif 1458 cd = dev->dv_cfdriver; 1459 KASSERT(cd != NULL); 1460 1461 ca = dev->dv_cfattach; 1462 KASSERT(ca != NULL); 1463 1464 KASSERT(curlwp != NULL); 1465 mutex_enter(&alldevs_mtx); 1466 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 1467 ; 1468 else while (alldevs_nread != 0 || 1469 (alldevs_nwrite != 0 && alldevs_writer != curlwp)) 1470 cv_wait(&alldevs_cv, &alldevs_mtx); 1471 if (alldevs_nwrite++ == 0) 1472 alldevs_writer = curlwp; 1473 mutex_exit(&alldevs_mtx); 1474 1475 /* 1476 * Ensure the device is deactivated. If the device doesn't 1477 * have an activation entry point, we allow DVF_ACTIVE to 1478 * remain set. Otherwise, if DVF_ACTIVE is still set, the 1479 * device is busy, and the detach fails. 1480 */ 1481 if (ca->ca_activate != NULL) 1482 rv = config_deactivate(dev); 1483 1484 /* 1485 * Try to detach the device. If that's not possible, then 1486 * we either panic() (for the forced but failed case), or 1487 * return an error. 1488 */ 1489 if (rv == 0) { 1490 if (ca->ca_detach != NULL) 1491 rv = (*ca->ca_detach)(dev, flags); 1492 else 1493 rv = EOPNOTSUPP; 1494 } 1495 if (rv != 0) { 1496 if ((flags & DETACH_FORCE) == 0) 1497 goto out; 1498 else 1499 panic("config_detach: forced detach of %s failed (%d)", 1500 device_xname(dev), rv); 1501 } 1502 1503 /* 1504 * The device has now been successfully detached. 1505 */ 1506 1507 /* Let userland know */ 1508 devmon_report_device(dev, false); 1509 1510 #ifdef DIAGNOSTIC 1511 /* 1512 * Sanity: If you're successfully detached, you should have no 1513 * children. (Note that because children must be attached 1514 * after parents, we only need to search the latter part of 1515 * the list.) 1516 */ 1517 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1518 d = TAILQ_NEXT(d, dv_list)) { 1519 if (d->dv_parent == dev) { 1520 printf("config_detach: detached device %s" 1521 " has children %s\n", device_xname(dev), device_xname(d)); 1522 panic("config_detach"); 1523 } 1524 } 1525 #endif 1526 1527 /* notify the parent that the child is gone */ 1528 if (dev->dv_parent) { 1529 device_t p = dev->dv_parent; 1530 if (p->dv_cfattach->ca_childdetached) 1531 (*p->dv_cfattach->ca_childdetached)(p, dev); 1532 } 1533 1534 /* 1535 * Mark cfdata to show that the unit can be reused, if possible. 1536 */ 1537 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1538 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1539 if (STREQ(cf->cf_name, cd->cd_name)) { 1540 if (cf->cf_fstate == FSTATE_FOUND && 1541 cf->cf_unit == dev->dv_unit) 1542 cf->cf_fstate = FSTATE_NOTFOUND; 1543 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1544 /* 1545 * Note that we can only re-use a starred 1546 * unit number if the unit being detached 1547 * had the last assigned unit number. 1548 */ 1549 if (cf->cf_fstate == FSTATE_STAR && 1550 cf->cf_unit == dev->dv_unit + 1) 1551 cf->cf_unit--; 1552 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 1553 } 1554 } 1555 } 1556 1557 config_devunlink(dev); 1558 1559 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1560 aprint_normal_dev(dev, "detached\n"); 1561 1562 config_devdealloc(dev); 1563 1564 out: 1565 mutex_enter(&alldevs_mtx); 1566 if (--alldevs_nwrite == 0) 1567 alldevs_writer = NULL; 1568 cv_signal(&alldevs_cv); 1569 mutex_exit(&alldevs_mtx); 1570 return rv; 1571 } 1572 1573 int 1574 config_detach_children(device_t parent, int flags) 1575 { 1576 device_t dv; 1577 deviter_t di; 1578 int error = 0; 1579 1580 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1581 dv = deviter_next(&di)) { 1582 if (device_parent(dv) != parent) 1583 continue; 1584 if ((error = config_detach(dv, flags)) != 0) 1585 break; 1586 } 1587 deviter_release(&di); 1588 return error; 1589 } 1590 1591 int 1592 config_activate(device_t dev) 1593 { 1594 const struct cfattach *ca = dev->dv_cfattach; 1595 int rv = 0, oflags = dev->dv_flags; 1596 1597 if (ca->ca_activate == NULL) 1598 return (EOPNOTSUPP); 1599 1600 if ((dev->dv_flags & DVF_ACTIVE) == 0) { 1601 dev->dv_flags |= DVF_ACTIVE; 1602 rv = (*ca->ca_activate)(dev, DVACT_ACTIVATE); 1603 if (rv) 1604 dev->dv_flags = oflags; 1605 } 1606 return (rv); 1607 } 1608 1609 int 1610 config_deactivate(device_t dev) 1611 { 1612 const struct cfattach *ca = dev->dv_cfattach; 1613 int rv = 0, oflags = dev->dv_flags; 1614 1615 if (ca->ca_activate == NULL) 1616 return (EOPNOTSUPP); 1617 1618 if (dev->dv_flags & DVF_ACTIVE) { 1619 dev->dv_flags &= ~DVF_ACTIVE; 1620 rv = (*ca->ca_activate)(dev, DVACT_DEACTIVATE); 1621 if (rv) 1622 dev->dv_flags = oflags; 1623 } 1624 return (rv); 1625 } 1626 1627 /* 1628 * Defer the configuration of the specified device until all 1629 * of its parent's devices have been attached. 1630 */ 1631 void 1632 config_defer(device_t dev, void (*func)(device_t)) 1633 { 1634 struct deferred_config *dc; 1635 1636 if (dev->dv_parent == NULL) 1637 panic("config_defer: can't defer config of a root device"); 1638 1639 #ifdef DIAGNOSTIC 1640 for (dc = TAILQ_FIRST(&deferred_config_queue); dc != NULL; 1641 dc = TAILQ_NEXT(dc, dc_queue)) { 1642 if (dc->dc_dev == dev) 1643 panic("config_defer: deferred twice"); 1644 } 1645 #endif 1646 1647 dc = malloc(sizeof(*dc), M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 1648 if (dc == NULL) 1649 panic("config_defer: unable to allocate callback"); 1650 1651 dc->dc_dev = dev; 1652 dc->dc_func = func; 1653 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 1654 config_pending_incr(); 1655 } 1656 1657 /* 1658 * Defer some autoconfiguration for a device until after interrupts 1659 * are enabled. 1660 */ 1661 void 1662 config_interrupts(device_t dev, void (*func)(device_t)) 1663 { 1664 struct deferred_config *dc; 1665 1666 /* 1667 * If interrupts are enabled, callback now. 1668 */ 1669 if (cold == 0) { 1670 (*func)(dev); 1671 return; 1672 } 1673 1674 #ifdef DIAGNOSTIC 1675 for (dc = TAILQ_FIRST(&interrupt_config_queue); dc != NULL; 1676 dc = TAILQ_NEXT(dc, dc_queue)) { 1677 if (dc->dc_dev == dev) 1678 panic("config_interrupts: deferred twice"); 1679 } 1680 #endif 1681 1682 dc = malloc(sizeof(*dc), M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 1683 if (dc == NULL) 1684 panic("config_interrupts: unable to allocate callback"); 1685 1686 dc->dc_dev = dev; 1687 dc->dc_func = func; 1688 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 1689 config_pending_incr(); 1690 } 1691 1692 /* 1693 * Process a deferred configuration queue. 1694 */ 1695 static void 1696 config_process_deferred(struct deferred_config_head *queue, 1697 device_t parent) 1698 { 1699 struct deferred_config *dc, *ndc; 1700 1701 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 1702 ndc = TAILQ_NEXT(dc, dc_queue); 1703 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 1704 TAILQ_REMOVE(queue, dc, dc_queue); 1705 (*dc->dc_func)(dc->dc_dev); 1706 free(dc, M_DEVBUF); 1707 config_pending_decr(); 1708 } 1709 } 1710 } 1711 1712 /* 1713 * Manipulate the config_pending semaphore. 1714 */ 1715 void 1716 config_pending_incr(void) 1717 { 1718 1719 config_pending++; 1720 } 1721 1722 void 1723 config_pending_decr(void) 1724 { 1725 1726 #ifdef DIAGNOSTIC 1727 if (config_pending == 0) 1728 panic("config_pending_decr: config_pending == 0"); 1729 #endif 1730 config_pending--; 1731 if (config_pending == 0) 1732 wakeup(&config_pending); 1733 } 1734 1735 /* 1736 * Register a "finalization" routine. Finalization routines are 1737 * called iteratively once all real devices have been found during 1738 * autoconfiguration, for as long as any one finalizer has done 1739 * any work. 1740 */ 1741 int 1742 config_finalize_register(device_t dev, int (*fn)(device_t)) 1743 { 1744 struct finalize_hook *f; 1745 1746 /* 1747 * If finalization has already been done, invoke the 1748 * callback function now. 1749 */ 1750 if (config_finalize_done) { 1751 while ((*fn)(dev) != 0) 1752 /* loop */ ; 1753 } 1754 1755 /* Ensure this isn't already on the list. */ 1756 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 1757 if (f->f_func == fn && f->f_dev == dev) 1758 return (EEXIST); 1759 } 1760 1761 f = malloc(sizeof(*f), M_TEMP, M_WAITOK); 1762 f->f_func = fn; 1763 f->f_dev = dev; 1764 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 1765 1766 return (0); 1767 } 1768 1769 void 1770 config_finalize(void) 1771 { 1772 struct finalize_hook *f; 1773 struct pdevinit *pdev; 1774 extern struct pdevinit pdevinit[]; 1775 int errcnt, rv; 1776 1777 /* 1778 * Now that device driver threads have been created, wait for 1779 * them to finish any deferred autoconfiguration. 1780 */ 1781 while (config_pending) 1782 (void) tsleep(&config_pending, PWAIT, "cfpend", hz); 1783 1784 /* Attach pseudo-devices. */ 1785 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 1786 (*pdev->pdev_attach)(pdev->pdev_count); 1787 1788 /* Run the hooks until none of them does any work. */ 1789 do { 1790 rv = 0; 1791 TAILQ_FOREACH(f, &config_finalize_list, f_list) 1792 rv |= (*f->f_func)(f->f_dev); 1793 } while (rv != 0); 1794 1795 config_finalize_done = 1; 1796 1797 /* Now free all the hooks. */ 1798 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 1799 TAILQ_REMOVE(&config_finalize_list, f, f_list); 1800 free(f, M_TEMP); 1801 } 1802 1803 errcnt = aprint_get_error_count(); 1804 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 1805 (boothowto & AB_VERBOSE) == 0) { 1806 if (config_do_twiddle) { 1807 config_do_twiddle = 0; 1808 printf_nolog("done.\n"); 1809 } 1810 if (errcnt != 0) { 1811 printf("WARNING: %d error%s while detecting hardware; " 1812 "check system log.\n", errcnt, 1813 errcnt == 1 ? "" : "s"); 1814 } 1815 } 1816 } 1817 1818 /* 1819 * device_lookup: 1820 * 1821 * Look up a device instance for a given driver. 1822 */ 1823 void * 1824 device_lookup(cfdriver_t cd, int unit) 1825 { 1826 1827 if (unit < 0 || unit >= cd->cd_ndevs) 1828 return (NULL); 1829 1830 return (cd->cd_devs[unit]); 1831 } 1832 1833 /* 1834 * device_lookup: 1835 * 1836 * Look up a device instance for a given driver. 1837 */ 1838 void * 1839 device_lookup_private(cfdriver_t cd, int unit) 1840 { 1841 device_t dv; 1842 1843 if (unit < 0 || unit >= cd->cd_ndevs) 1844 return NULL; 1845 1846 if ((dv = cd->cd_devs[unit]) == NULL) 1847 return NULL; 1848 1849 return dv->dv_private; 1850 } 1851 1852 /* 1853 * Accessor functions for the device_t type. 1854 */ 1855 devclass_t 1856 device_class(device_t dev) 1857 { 1858 1859 return (dev->dv_class); 1860 } 1861 1862 cfdata_t 1863 device_cfdata(device_t dev) 1864 { 1865 1866 return (dev->dv_cfdata); 1867 } 1868 1869 cfdriver_t 1870 device_cfdriver(device_t dev) 1871 { 1872 1873 return (dev->dv_cfdriver); 1874 } 1875 1876 cfattach_t 1877 device_cfattach(device_t dev) 1878 { 1879 1880 return (dev->dv_cfattach); 1881 } 1882 1883 int 1884 device_unit(device_t dev) 1885 { 1886 1887 return (dev->dv_unit); 1888 } 1889 1890 const char * 1891 device_xname(device_t dev) 1892 { 1893 1894 return (dev->dv_xname); 1895 } 1896 1897 device_t 1898 device_parent(device_t dev) 1899 { 1900 1901 return (dev->dv_parent); 1902 } 1903 1904 bool 1905 device_is_active(device_t dev) 1906 { 1907 int active_flags; 1908 1909 active_flags = DVF_ACTIVE; 1910 active_flags |= DVF_CLASS_SUSPENDED; 1911 active_flags |= DVF_DRIVER_SUSPENDED; 1912 active_flags |= DVF_BUS_SUSPENDED; 1913 1914 return ((dev->dv_flags & active_flags) == DVF_ACTIVE); 1915 } 1916 1917 bool 1918 device_is_enabled(device_t dev) 1919 { 1920 return (dev->dv_flags & DVF_ACTIVE) == DVF_ACTIVE; 1921 } 1922 1923 bool 1924 device_has_power(device_t dev) 1925 { 1926 int active_flags; 1927 1928 active_flags = DVF_ACTIVE | DVF_BUS_SUSPENDED; 1929 1930 return ((dev->dv_flags & active_flags) == DVF_ACTIVE); 1931 } 1932 1933 int 1934 device_locator(device_t dev, u_int locnum) 1935 { 1936 1937 KASSERT(dev->dv_locators != NULL); 1938 return (dev->dv_locators[locnum]); 1939 } 1940 1941 void * 1942 device_private(device_t dev) 1943 { 1944 1945 /* 1946 * The reason why device_private(NULL) is allowed is to simplify the 1947 * work of a lot of userspace request handlers (i.e., c/bdev 1948 * handlers) which grab cfdriver_t->cd_units[n]. 1949 * It avoids having them test for it to be NULL and only then calling 1950 * device_private. 1951 */ 1952 return dev == NULL ? NULL : dev->dv_private; 1953 } 1954 1955 prop_dictionary_t 1956 device_properties(device_t dev) 1957 { 1958 1959 return (dev->dv_properties); 1960 } 1961 1962 /* 1963 * device_is_a: 1964 * 1965 * Returns true if the device is an instance of the specified 1966 * driver. 1967 */ 1968 bool 1969 device_is_a(device_t dev, const char *dname) 1970 { 1971 1972 return (strcmp(dev->dv_cfdriver->cd_name, dname) == 0); 1973 } 1974 1975 /* 1976 * device_find_by_xname: 1977 * 1978 * Returns the device of the given name or NULL if it doesn't exist. 1979 */ 1980 device_t 1981 device_find_by_xname(const char *name) 1982 { 1983 device_t dv; 1984 deviter_t di; 1985 1986 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 1987 if (strcmp(device_xname(dv), name) == 0) 1988 break; 1989 } 1990 deviter_release(&di); 1991 1992 return dv; 1993 } 1994 1995 /* 1996 * device_find_by_driver_unit: 1997 * 1998 * Returns the device of the given driver name and unit or 1999 * NULL if it doesn't exist. 2000 */ 2001 device_t 2002 device_find_by_driver_unit(const char *name, int unit) 2003 { 2004 struct cfdriver *cd; 2005 2006 if ((cd = config_cfdriver_lookup(name)) == NULL) 2007 return NULL; 2008 return device_lookup(cd, unit); 2009 } 2010 2011 /* 2012 * Power management related functions. 2013 */ 2014 2015 bool 2016 device_pmf_is_registered(device_t dev) 2017 { 2018 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 2019 } 2020 2021 bool 2022 device_pmf_driver_suspend(device_t dev PMF_FN_ARGS) 2023 { 2024 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2025 return true; 2026 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2027 return false; 2028 if (*dev->dv_driver_suspend != NULL && 2029 !(*dev->dv_driver_suspend)(dev PMF_FN_CALL)) 2030 return false; 2031 2032 dev->dv_flags |= DVF_DRIVER_SUSPENDED; 2033 return true; 2034 } 2035 2036 bool 2037 device_pmf_driver_resume(device_t dev PMF_FN_ARGS) 2038 { 2039 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2040 return true; 2041 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2042 return false; 2043 if ((flags & PMF_F_SELF) != 0 && !device_is_self_suspended(dev)) 2044 return false; 2045 if (*dev->dv_driver_resume != NULL && 2046 !(*dev->dv_driver_resume)(dev PMF_FN_CALL)) 2047 return false; 2048 2049 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 2050 return true; 2051 } 2052 2053 bool 2054 device_pmf_driver_shutdown(device_t dev, int how) 2055 { 2056 2057 if (*dev->dv_driver_shutdown != NULL && 2058 !(*dev->dv_driver_shutdown)(dev, how)) 2059 return false; 2060 return true; 2061 } 2062 2063 bool 2064 device_pmf_driver_register(device_t dev, 2065 bool (*suspend)(device_t PMF_FN_PROTO), 2066 bool (*resume)(device_t PMF_FN_PROTO), 2067 bool (*shutdown)(device_t, int)) 2068 { 2069 pmf_private_t *pp; 2070 2071 if ((pp = malloc(sizeof(*pp), M_PMFPRIV, M_NOWAIT|M_ZERO)) == NULL) 2072 return false; 2073 mutex_init(&pp->pp_mtx, MUTEX_DEFAULT, IPL_NONE); 2074 cv_init(&pp->pp_cv, "pmfsusp"); 2075 dev->dv_pmf_private = pp; 2076 2077 dev->dv_driver_suspend = suspend; 2078 dev->dv_driver_resume = resume; 2079 dev->dv_driver_shutdown = shutdown; 2080 dev->dv_flags |= DVF_POWER_HANDLERS; 2081 return true; 2082 } 2083 2084 static const char * 2085 curlwp_name(void) 2086 { 2087 if (curlwp->l_name != NULL) 2088 return curlwp->l_name; 2089 else 2090 return curlwp->l_proc->p_comm; 2091 } 2092 2093 void 2094 device_pmf_driver_deregister(device_t dev) 2095 { 2096 pmf_private_t *pp = dev->dv_pmf_private; 2097 2098 dev->dv_driver_suspend = NULL; 2099 dev->dv_driver_resume = NULL; 2100 2101 dev->dv_pmf_private = NULL; 2102 2103 mutex_enter(&pp->pp_mtx); 2104 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2105 while (pp->pp_nlock > 0 || pp->pp_nwait > 0) { 2106 /* Wake a thread that waits for the lock. That 2107 * thread will fail to acquire the lock, and then 2108 * it will wake the next thread that waits for the 2109 * lock, or else it will wake us. 2110 */ 2111 cv_signal(&pp->pp_cv); 2112 pmflock_debug(dev, __func__, __LINE__); 2113 cv_wait(&pp->pp_cv, &pp->pp_mtx); 2114 pmflock_debug(dev, __func__, __LINE__); 2115 } 2116 mutex_exit(&pp->pp_mtx); 2117 2118 cv_destroy(&pp->pp_cv); 2119 mutex_destroy(&pp->pp_mtx); 2120 free(pp, M_PMFPRIV); 2121 } 2122 2123 bool 2124 device_pmf_driver_child_register(device_t dev) 2125 { 2126 device_t parent = device_parent(dev); 2127 2128 if (parent == NULL || parent->dv_driver_child_register == NULL) 2129 return true; 2130 return (*parent->dv_driver_child_register)(dev); 2131 } 2132 2133 void 2134 device_pmf_driver_set_child_register(device_t dev, 2135 bool (*child_register)(device_t)) 2136 { 2137 dev->dv_driver_child_register = child_register; 2138 } 2139 2140 void 2141 device_pmf_self_resume(device_t dev PMF_FN_ARGS) 2142 { 2143 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2144 if ((dev->dv_flags & DVF_SELF_SUSPENDED) != 0) 2145 dev->dv_flags &= ~DVF_SELF_SUSPENDED; 2146 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2147 } 2148 2149 bool 2150 device_is_self_suspended(device_t dev) 2151 { 2152 return (dev->dv_flags & DVF_SELF_SUSPENDED) != 0; 2153 } 2154 2155 void 2156 device_pmf_self_suspend(device_t dev PMF_FN_ARGS) 2157 { 2158 bool self = (flags & PMF_F_SELF) != 0; 2159 2160 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2161 2162 if (!self) 2163 dev->dv_flags &= ~DVF_SELF_SUSPENDED; 2164 else if (device_is_active(dev)) 2165 dev->dv_flags |= DVF_SELF_SUSPENDED; 2166 2167 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2168 } 2169 2170 static void 2171 pmflock_debug(device_t dev, const char *func, int line) 2172 { 2173 pmf_private_t *pp = device_pmf_private(dev); 2174 2175 aprint_debug_dev(dev, "%s.%d, %s pp_nlock %d pp_nwait %d dv_flags %x\n", 2176 func, line, curlwp_name(), pp->pp_nlock, pp->pp_nwait, 2177 dev->dv_flags); 2178 } 2179 2180 static void 2181 pmflock_debug_with_flags(device_t dev, const char *func, int line PMF_FN_ARGS) 2182 { 2183 pmf_private_t *pp = device_pmf_private(dev); 2184 2185 aprint_debug_dev(dev, "%s.%d, %s pp_nlock %d pp_nwait %d dv_flags %x " 2186 "flags " PMF_FLAGS_FMT "\n", func, line, curlwp_name(), 2187 pp->pp_nlock, pp->pp_nwait, dev->dv_flags PMF_FN_CALL); 2188 } 2189 2190 static bool 2191 device_pmf_lock1(device_t dev PMF_FN_ARGS) 2192 { 2193 pmf_private_t *pp = device_pmf_private(dev); 2194 2195 while (pp->pp_nlock > 0 && pp->pp_holder != curlwp && 2196 device_pmf_is_registered(dev)) { 2197 pp->pp_nwait++; 2198 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2199 cv_wait(&pp->pp_cv, &pp->pp_mtx); 2200 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2201 pp->pp_nwait--; 2202 } 2203 if (!device_pmf_is_registered(dev)) { 2204 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2205 /* We could not acquire the lock, but some other thread may 2206 * wait for it, also. Wake that thread. 2207 */ 2208 cv_signal(&pp->pp_cv); 2209 return false; 2210 } 2211 pp->pp_nlock++; 2212 pp->pp_holder = curlwp; 2213 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2214 return true; 2215 } 2216 2217 bool 2218 device_pmf_lock(device_t dev PMF_FN_ARGS) 2219 { 2220 bool rc; 2221 pmf_private_t *pp = device_pmf_private(dev); 2222 2223 mutex_enter(&pp->pp_mtx); 2224 rc = device_pmf_lock1(dev PMF_FN_CALL); 2225 mutex_exit(&pp->pp_mtx); 2226 2227 return rc; 2228 } 2229 2230 void 2231 device_pmf_unlock(device_t dev PMF_FN_ARGS) 2232 { 2233 pmf_private_t *pp = device_pmf_private(dev); 2234 2235 KASSERT(pp->pp_nlock > 0); 2236 mutex_enter(&pp->pp_mtx); 2237 if (--pp->pp_nlock == 0) 2238 pp->pp_holder = NULL; 2239 cv_signal(&pp->pp_cv); 2240 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2241 mutex_exit(&pp->pp_mtx); 2242 } 2243 2244 void * 2245 device_pmf_private(device_t dev) 2246 { 2247 return dev->dv_pmf_private; 2248 } 2249 2250 void * 2251 device_pmf_bus_private(device_t dev) 2252 { 2253 return dev->dv_bus_private; 2254 } 2255 2256 bool 2257 device_pmf_bus_suspend(device_t dev PMF_FN_ARGS) 2258 { 2259 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2260 return true; 2261 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2262 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2263 return false; 2264 if (*dev->dv_bus_suspend != NULL && 2265 !(*dev->dv_bus_suspend)(dev PMF_FN_CALL)) 2266 return false; 2267 2268 dev->dv_flags |= DVF_BUS_SUSPENDED; 2269 return true; 2270 } 2271 2272 bool 2273 device_pmf_bus_resume(device_t dev PMF_FN_ARGS) 2274 { 2275 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2276 return true; 2277 if ((flags & PMF_F_SELF) != 0 && !device_is_self_suspended(dev)) 2278 return false; 2279 if (*dev->dv_bus_resume != NULL && 2280 !(*dev->dv_bus_resume)(dev PMF_FN_CALL)) 2281 return false; 2282 2283 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2284 return true; 2285 } 2286 2287 bool 2288 device_pmf_bus_shutdown(device_t dev, int how) 2289 { 2290 2291 if (*dev->dv_bus_shutdown != NULL && 2292 !(*dev->dv_bus_shutdown)(dev, how)) 2293 return false; 2294 return true; 2295 } 2296 2297 void 2298 device_pmf_bus_register(device_t dev, void *priv, 2299 bool (*suspend)(device_t PMF_FN_PROTO), 2300 bool (*resume)(device_t PMF_FN_PROTO), 2301 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2302 { 2303 dev->dv_bus_private = priv; 2304 dev->dv_bus_resume = resume; 2305 dev->dv_bus_suspend = suspend; 2306 dev->dv_bus_shutdown = shutdown; 2307 dev->dv_bus_deregister = deregister; 2308 } 2309 2310 void 2311 device_pmf_bus_deregister(device_t dev) 2312 { 2313 if (dev->dv_bus_deregister == NULL) 2314 return; 2315 (*dev->dv_bus_deregister)(dev); 2316 dev->dv_bus_private = NULL; 2317 dev->dv_bus_suspend = NULL; 2318 dev->dv_bus_resume = NULL; 2319 dev->dv_bus_deregister = NULL; 2320 } 2321 2322 void * 2323 device_pmf_class_private(device_t dev) 2324 { 2325 return dev->dv_class_private; 2326 } 2327 2328 bool 2329 device_pmf_class_suspend(device_t dev PMF_FN_ARGS) 2330 { 2331 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2332 return true; 2333 if (*dev->dv_class_suspend != NULL && 2334 !(*dev->dv_class_suspend)(dev PMF_FN_CALL)) 2335 return false; 2336 2337 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2338 return true; 2339 } 2340 2341 bool 2342 device_pmf_class_resume(device_t dev PMF_FN_ARGS) 2343 { 2344 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2345 return true; 2346 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2347 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2348 return false; 2349 if (*dev->dv_class_resume != NULL && 2350 !(*dev->dv_class_resume)(dev PMF_FN_CALL)) 2351 return false; 2352 2353 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2354 return true; 2355 } 2356 2357 void 2358 device_pmf_class_register(device_t dev, void *priv, 2359 bool (*suspend)(device_t PMF_FN_PROTO), 2360 bool (*resume)(device_t PMF_FN_PROTO), 2361 void (*deregister)(device_t)) 2362 { 2363 dev->dv_class_private = priv; 2364 dev->dv_class_suspend = suspend; 2365 dev->dv_class_resume = resume; 2366 dev->dv_class_deregister = deregister; 2367 } 2368 2369 void 2370 device_pmf_class_deregister(device_t dev) 2371 { 2372 if (dev->dv_class_deregister == NULL) 2373 return; 2374 (*dev->dv_class_deregister)(dev); 2375 dev->dv_class_private = NULL; 2376 dev->dv_class_suspend = NULL; 2377 dev->dv_class_resume = NULL; 2378 dev->dv_class_deregister = NULL; 2379 } 2380 2381 bool 2382 device_active(device_t dev, devactive_t type) 2383 { 2384 size_t i; 2385 2386 if (dev->dv_activity_count == 0) 2387 return false; 2388 2389 for (i = 0; i < dev->dv_activity_count; ++i) 2390 (*dev->dv_activity_handlers[i])(dev, type); 2391 2392 return true; 2393 } 2394 2395 bool 2396 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2397 { 2398 void (**new_handlers)(device_t, devactive_t); 2399 void (**old_handlers)(device_t, devactive_t); 2400 size_t i, new_size; 2401 int s; 2402 2403 old_handlers = dev->dv_activity_handlers; 2404 2405 for (i = 0; i < dev->dv_activity_count; ++i) { 2406 if (old_handlers[i] == handler) 2407 panic("Double registering of idle handlers"); 2408 } 2409 2410 new_size = dev->dv_activity_count + 1; 2411 new_handlers = malloc(sizeof(void *) * new_size, M_DEVBUF, M_WAITOK); 2412 2413 memcpy(new_handlers, old_handlers, 2414 sizeof(void *) * dev->dv_activity_count); 2415 new_handlers[new_size - 1] = handler; 2416 2417 s = splhigh(); 2418 dev->dv_activity_count = new_size; 2419 dev->dv_activity_handlers = new_handlers; 2420 splx(s); 2421 2422 if (old_handlers != NULL) 2423 free(old_handlers, M_DEVBUF); 2424 2425 return true; 2426 } 2427 2428 void 2429 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2430 { 2431 void (**new_handlers)(device_t, devactive_t); 2432 void (**old_handlers)(device_t, devactive_t); 2433 size_t i, new_size; 2434 int s; 2435 2436 old_handlers = dev->dv_activity_handlers; 2437 2438 for (i = 0; i < dev->dv_activity_count; ++i) { 2439 if (old_handlers[i] == handler) 2440 break; 2441 } 2442 2443 if (i == dev->dv_activity_count) 2444 return; /* XXX panic? */ 2445 2446 new_size = dev->dv_activity_count - 1; 2447 2448 if (new_size == 0) { 2449 new_handlers = NULL; 2450 } else { 2451 new_handlers = malloc(sizeof(void *) * new_size, M_DEVBUF, 2452 M_WAITOK); 2453 memcpy(new_handlers, old_handlers, sizeof(void *) * i); 2454 memcpy(new_handlers + i, old_handlers + i + 1, 2455 sizeof(void *) * (new_size - i)); 2456 } 2457 2458 s = splhigh(); 2459 dev->dv_activity_count = new_size; 2460 dev->dv_activity_handlers = new_handlers; 2461 splx(s); 2462 2463 free(old_handlers, M_DEVBUF); 2464 } 2465 2466 /* 2467 * Device Iteration 2468 * 2469 * deviter_t: a device iterator. Holds state for a "walk" visiting 2470 * each device_t's in the device tree. 2471 * 2472 * deviter_init(di, flags): initialize the device iterator `di' 2473 * to "walk" the device tree. deviter_next(di) will return 2474 * the first device_t in the device tree, or NULL if there are 2475 * no devices. 2476 * 2477 * `flags' is one or more of DEVITER_F_RW, indicating that the 2478 * caller intends to modify the device tree by calling 2479 * config_detach(9) on devices in the order that the iterator 2480 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2481 * nearest the "root" of the device tree to be returned, first; 2482 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2483 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2484 * indicating both that deviter_init() should not respect any 2485 * locks on the device tree, and that deviter_next(di) may run 2486 * in more than one LWP before the walk has finished. 2487 * 2488 * Only one DEVITER_F_RW iterator may be in the device tree at 2489 * once. 2490 * 2491 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2492 * 2493 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2494 * DEVITER_F_LEAVES_FIRST are used in combination. 2495 * 2496 * deviter_first(di, flags): initialize the device iterator `di' 2497 * and return the first device_t in the device tree, or NULL 2498 * if there are no devices. The statement 2499 * 2500 * dv = deviter_first(di); 2501 * 2502 * is shorthand for 2503 * 2504 * deviter_init(di); 2505 * dv = deviter_next(di); 2506 * 2507 * deviter_next(di): return the next device_t in the device tree, 2508 * or NULL if there are no more devices. deviter_next(di) 2509 * is undefined if `di' was not initialized with deviter_init() or 2510 * deviter_first(). 2511 * 2512 * deviter_release(di): stops iteration (subsequent calls to 2513 * deviter_next() will return NULL), releases any locks and 2514 * resources held by the device iterator. 2515 * 2516 * Device iteration does not return device_t's in any particular 2517 * order. An iterator will never return the same device_t twice. 2518 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2519 * is called repeatedly on the same `di', it will eventually return 2520 * NULL. It is ok to attach/detach devices during device iteration. 2521 */ 2522 void 2523 deviter_init(deviter_t *di, deviter_flags_t flags) 2524 { 2525 device_t dv; 2526 bool rw; 2527 2528 mutex_enter(&alldevs_mtx); 2529 if ((flags & DEVITER_F_SHUTDOWN) != 0) { 2530 flags |= DEVITER_F_RW; 2531 alldevs_nwrite++; 2532 alldevs_writer = NULL; 2533 alldevs_nread = 0; 2534 } else { 2535 rw = (flags & DEVITER_F_RW) != 0; 2536 2537 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 2538 ; 2539 else while ((alldevs_nwrite != 0 && alldevs_writer != curlwp) || 2540 (rw && alldevs_nread != 0)) 2541 cv_wait(&alldevs_cv, &alldevs_mtx); 2542 2543 if (rw) { 2544 if (alldevs_nwrite++ == 0) 2545 alldevs_writer = curlwp; 2546 } else 2547 alldevs_nread++; 2548 } 2549 mutex_exit(&alldevs_mtx); 2550 2551 memset(di, 0, sizeof(*di)); 2552 2553 di->di_flags = flags; 2554 2555 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2556 case DEVITER_F_LEAVES_FIRST: 2557 TAILQ_FOREACH(dv, &alldevs, dv_list) 2558 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2559 break; 2560 case DEVITER_F_ROOT_FIRST: 2561 TAILQ_FOREACH(dv, &alldevs, dv_list) 2562 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2563 break; 2564 default: 2565 break; 2566 } 2567 2568 deviter_reinit(di); 2569 } 2570 2571 static void 2572 deviter_reinit(deviter_t *di) 2573 { 2574 if ((di->di_flags & DEVITER_F_RW) != 0) 2575 di->di_prev = TAILQ_LAST(&alldevs, devicelist); 2576 else 2577 di->di_prev = TAILQ_FIRST(&alldevs); 2578 } 2579 2580 device_t 2581 deviter_first(deviter_t *di, deviter_flags_t flags) 2582 { 2583 deviter_init(di, flags); 2584 return deviter_next(di); 2585 } 2586 2587 static device_t 2588 deviter_next1(deviter_t *di) 2589 { 2590 device_t dv; 2591 2592 dv = di->di_prev; 2593 2594 if (dv == NULL) 2595 ; 2596 else if ((di->di_flags & DEVITER_F_RW) != 0) 2597 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2598 else 2599 di->di_prev = TAILQ_NEXT(dv, dv_list); 2600 2601 return dv; 2602 } 2603 2604 device_t 2605 deviter_next(deviter_t *di) 2606 { 2607 device_t dv = NULL; 2608 2609 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2610 case 0: 2611 return deviter_next1(di); 2612 case DEVITER_F_LEAVES_FIRST: 2613 while (di->di_curdepth >= 0) { 2614 if ((dv = deviter_next1(di)) == NULL) { 2615 di->di_curdepth--; 2616 deviter_reinit(di); 2617 } else if (dv->dv_depth == di->di_curdepth) 2618 break; 2619 } 2620 return dv; 2621 case DEVITER_F_ROOT_FIRST: 2622 while (di->di_curdepth <= di->di_maxdepth) { 2623 if ((dv = deviter_next1(di)) == NULL) { 2624 di->di_curdepth++; 2625 deviter_reinit(di); 2626 } else if (dv->dv_depth == di->di_curdepth) 2627 break; 2628 } 2629 return dv; 2630 default: 2631 return NULL; 2632 } 2633 } 2634 2635 void 2636 deviter_release(deviter_t *di) 2637 { 2638 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 2639 2640 mutex_enter(&alldevs_mtx); 2641 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 2642 --alldevs_nwrite; 2643 else { 2644 2645 if (rw) { 2646 if (--alldevs_nwrite == 0) 2647 alldevs_writer = NULL; 2648 } else 2649 --alldevs_nread; 2650 2651 cv_signal(&alldevs_cv); 2652 } 2653 mutex_exit(&alldevs_mtx); 2654 } 2655
Indexes created Fri Sep 26 08:10:20 GMT 2025