subr_autoconf.c revision 1.153
1 /* $NetBSD: subr_autoconf.c,v 1.153 2008/06/05 21:55:51 cegger 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 1.153 2008/06/05 21:55:51 cegger 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 #include <sys/cpu.h> 110 111 #include <sys/disk.h> 112 113 #include <machine/limits.h> 114 115 #include "opt_userconf.h" 116 #ifdef USERCONF 117 #include <sys/userconf.h> 118 #endif 119 120 #ifdef __i386__ 121 #include "opt_splash.h" 122 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 123 #include <dev/splash/splash.h> 124 extern struct splash_progress *splash_progress_state; 125 #endif 126 #endif 127 128 /* 129 * Autoconfiguration subroutines. 130 */ 131 132 typedef struct pmf_private { 133 int pp_nwait; 134 int pp_nlock; 135 lwp_t *pp_holder; 136 kmutex_t pp_mtx; 137 kcondvar_t pp_cv; 138 } pmf_private_t; 139 140 /* 141 * ioconf.c exports exactly two names: cfdata and cfroots. All system 142 * devices and drivers are found via these tables. 143 */ 144 extern struct cfdata cfdata[]; 145 extern const short cfroots[]; 146 147 /* 148 * List of all cfdriver structures. We use this to detect duplicates 149 * when other cfdrivers are loaded. 150 */ 151 struct cfdriverlist allcfdrivers = LIST_HEAD_INITIALIZER(&allcfdrivers); 152 extern struct cfdriver * const cfdriver_list_initial[]; 153 154 /* 155 * Initial list of cfattach's. 156 */ 157 extern const struct cfattachinit cfattachinit[]; 158 159 /* 160 * List of cfdata tables. We always have one such list -- the one 161 * built statically when the kernel was configured. 162 */ 163 struct cftablelist allcftables = TAILQ_HEAD_INITIALIZER(allcftables); 164 static struct cftable initcftable; 165 166 #define ROOT ((device_t)NULL) 167 168 struct matchinfo { 169 cfsubmatch_t fn; 170 struct device *parent; 171 const int *locs; 172 void *aux; 173 struct cfdata *match; 174 int pri; 175 }; 176 177 static char *number(char *, int); 178 static void mapply(struct matchinfo *, cfdata_t); 179 static device_t config_devalloc(const device_t, const cfdata_t, const int *); 180 static void config_devdealloc(device_t); 181 static void config_makeroom(int, struct cfdriver *); 182 static void config_devlink(device_t); 183 static void config_devunlink(device_t); 184 185 static void pmflock_debug(device_t, const char *, int); 186 static void pmflock_debug_with_flags(device_t, const char *, int PMF_FN_PROTO); 187 188 static device_t deviter_next1(deviter_t *); 189 static void deviter_reinit(deviter_t *); 190 191 struct deferred_config { 192 TAILQ_ENTRY(deferred_config) dc_queue; 193 device_t dc_dev; 194 void (*dc_func)(device_t); 195 }; 196 197 TAILQ_HEAD(deferred_config_head, deferred_config); 198 199 struct deferred_config_head deferred_config_queue = 200 TAILQ_HEAD_INITIALIZER(deferred_config_queue); 201 struct deferred_config_head interrupt_config_queue = 202 TAILQ_HEAD_INITIALIZER(interrupt_config_queue); 203 int interrupt_config_threads = 8; 204 205 static void config_process_deferred(struct deferred_config_head *, device_t); 206 207 /* Hooks to finalize configuration once all real devices have been found. */ 208 struct finalize_hook { 209 TAILQ_ENTRY(finalize_hook) f_list; 210 int (*f_func)(device_t); 211 device_t f_dev; 212 }; 213 static TAILQ_HEAD(, finalize_hook) config_finalize_list = 214 TAILQ_HEAD_INITIALIZER(config_finalize_list); 215 static int config_finalize_done; 216 217 /* list of all devices */ 218 struct devicelist alldevs = TAILQ_HEAD_INITIALIZER(alldevs); 219 kcondvar_t alldevs_cv; 220 kmutex_t alldevs_mtx; 221 static int alldevs_nread = 0; 222 static int alldevs_nwrite = 0; 223 static lwp_t *alldevs_writer = NULL; 224 225 static int config_pending; /* semaphore for mountroot */ 226 static kmutex_t config_misc_lock; 227 static kcondvar_t config_misc_cv; 228 229 #define STREQ(s1, s2) \ 230 (*(s1) == *(s2) && strcmp((s1), (s2)) == 0) 231 232 static int config_initialized; /* config_init() has been called. */ 233 234 static int config_do_twiddle; 235 236 MALLOC_DEFINE(M_PMFPRIV, "pmfpriv", "device pmf private storage"); 237 238 struct vnode * 239 opendisk(struct device *dv) 240 { 241 int bmajor, bminor; 242 struct vnode *tmpvn; 243 int error; 244 dev_t dev; 245 246 /* 247 * Lookup major number for disk block device. 248 */ 249 bmajor = devsw_name2blk(device_xname(dv), NULL, 0); 250 if (bmajor == -1) 251 return NULL; 252 253 bminor = minor(device_unit(dv)); 254 /* 255 * Fake a temporary vnode for the disk, open it, and read 256 * and hash the sectors. 257 */ 258 dev = device_is_a(dv, "dk") ? makedev(bmajor, bminor) : 259 MAKEDISKDEV(bmajor, bminor, RAW_PART); 260 if (bdevvp(dev, &tmpvn)) 261 panic("%s: can't alloc vnode for %s", __func__, 262 device_xname(dv)); 263 error = VOP_OPEN(tmpvn, FREAD, NOCRED); 264 if (error) { 265 #ifndef DEBUG 266 /* 267 * Ignore errors caused by missing device, partition, 268 * or medium. 269 */ 270 if (error != ENXIO && error != ENODEV) 271 #endif 272 printf("%s: can't open dev %s (%d)\n", 273 __func__, device_xname(dv), error); 274 vput(tmpvn); 275 return NULL; 276 } 277 278 return tmpvn; 279 } 280 281 int 282 config_handle_wedges(struct device *dv, int par) 283 { 284 struct dkwedge_list wl; 285 struct dkwedge_info *wi; 286 struct vnode *vn; 287 char diskname[16]; 288 int i, error; 289 290 if ((vn = opendisk(dv)) == NULL) 291 return -1; 292 293 wl.dkwl_bufsize = sizeof(*wi) * 16; 294 wl.dkwl_buf = wi = malloc(wl.dkwl_bufsize, M_TEMP, M_WAITOK); 295 296 error = VOP_IOCTL(vn, DIOCLWEDGES, &wl, FREAD, NOCRED); 297 VOP_CLOSE(vn, FREAD, NOCRED); 298 vput(vn); 299 if (error) { 300 #ifdef DEBUG_WEDGE 301 printf("%s: List wedges returned %d\n", 302 device_xname(dv), error); 303 #endif 304 free(wi, M_TEMP); 305 return -1; 306 } 307 308 #ifdef DEBUG_WEDGE 309 printf("%s: Returned %u(%u) wedges\n", device_xname(dv), 310 wl.dkwl_nwedges, wl.dkwl_ncopied); 311 #endif 312 snprintf(diskname, sizeof(diskname), "%s%c", device_xname(dv), 313 par + 'a'); 314 315 for (i = 0; i < wl.dkwl_ncopied; i++) { 316 #ifdef DEBUG_WEDGE 317 printf("%s: Looking for %s in %s\n", 318 device_xname(dv), diskname, wi[i].dkw_wname); 319 #endif 320 if (strcmp(wi[i].dkw_wname, diskname) == 0) 321 break; 322 } 323 324 if (i == wl.dkwl_ncopied) { 325 #ifdef DEBUG_WEDGE 326 printf("%s: Cannot find wedge with parent %s\n", 327 device_xname(dv), diskname); 328 #endif 329 free(wi, M_TEMP); 330 return -1; 331 } 332 333 #ifdef DEBUG_WEDGE 334 printf("%s: Setting boot wedge %s (%s) at %llu %llu\n", 335 device_xname(dv), wi[i].dkw_devname, wi[i].dkw_wname, 336 (unsigned long long)wi[i].dkw_offset, 337 (unsigned long long)wi[i].dkw_size); 338 #endif 339 dkwedge_set_bootwedge(dv, wi[i].dkw_offset, wi[i].dkw_size); 340 free(wi, M_TEMP); 341 return 0; 342 } 343 344 /* 345 * Initialize the autoconfiguration data structures. Normally this 346 * is done by configure(), but some platforms need to do this very 347 * early (to e.g. initialize the console). 348 */ 349 void 350 config_init(void) 351 { 352 const struct cfattachinit *cfai; 353 int i, j; 354 355 if (config_initialized) 356 return; 357 358 mutex_init(&alldevs_mtx, MUTEX_DEFAULT, IPL_NONE); 359 cv_init(&alldevs_cv, "alldevs"); 360 361 mutex_init(&config_misc_lock, MUTEX_DEFAULT, IPL_NONE); 362 cv_init(&config_misc_cv, "cfgmisc"); 363 364 /* allcfdrivers is statically initialized. */ 365 for (i = 0; cfdriver_list_initial[i] != NULL; i++) { 366 if (config_cfdriver_attach(cfdriver_list_initial[i]) != 0) 367 panic("configure: duplicate `%s' drivers", 368 cfdriver_list_initial[i]->cd_name); 369 } 370 371 for (cfai = &cfattachinit[0]; cfai->cfai_name != NULL; cfai++) { 372 for (j = 0; cfai->cfai_list[j] != NULL; j++) { 373 if (config_cfattach_attach(cfai->cfai_name, 374 cfai->cfai_list[j]) != 0) 375 panic("configure: duplicate `%s' attachment " 376 "of `%s' driver", 377 cfai->cfai_list[j]->ca_name, 378 cfai->cfai_name); 379 } 380 } 381 382 initcftable.ct_cfdata = cfdata; 383 TAILQ_INSERT_TAIL(&allcftables, &initcftable, ct_list); 384 385 config_initialized = 1; 386 } 387 388 void 389 config_deferred(device_t dev) 390 { 391 config_process_deferred(&deferred_config_queue, dev); 392 config_process_deferred(&interrupt_config_queue, dev); 393 } 394 395 static void 396 config_interrupts_thread(void *cookie) 397 { 398 struct deferred_config *dc; 399 400 while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) { 401 TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue); 402 (*dc->dc_func)(dc->dc_dev); 403 free(dc, M_DEVBUF); 404 config_pending_decr(); 405 } 406 kthread_exit(0); 407 } 408 409 /* 410 * Configure the system's hardware. 411 */ 412 void 413 configure(void) 414 { 415 extern void ssp_init(void); 416 CPU_INFO_ITERATOR cii; 417 struct cpu_info *ci; 418 int i, s; 419 420 /* Initialize data structures. */ 421 config_init(); 422 pmf_init(); 423 #if NDRVCTL > 0 424 drvctl_init(); 425 #endif 426 427 #ifdef USERCONF 428 if (boothowto & RB_USERCONF) 429 user_config(); 430 #endif 431 432 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 433 config_do_twiddle = 1; 434 printf_nolog("Detecting hardware..."); 435 } 436 437 /* 438 * Do the machine-dependent portion of autoconfiguration. This 439 * sets the configuration machinery here in motion by "finding" 440 * the root bus. When this function returns, we expect interrupts 441 * to be enabled. 442 */ 443 cpu_configure(); 444 445 /* Initialize SSP. */ 446 ssp_init(); 447 448 /* 449 * Now that we've found all the hardware, start the real time 450 * and statistics clocks. 451 */ 452 initclocks(); 453 454 cold = 0; /* clocks are running, we're warm now! */ 455 s = splsched(); 456 curcpu()->ci_schedstate.spc_flags |= SPCF_RUNNING; 457 splx(s); 458 459 /* Boot the secondary processors. */ 460 for (CPU_INFO_FOREACH(cii, ci)) { 461 uvm_cpu_attach(ci); 462 } 463 mp_online = true; 464 #if defined(MULTIPROCESSOR) 465 cpu_boot_secondary_processors(); 466 #endif 467 468 /* Setup the runqueues and scheduler. */ 469 runq_init(); 470 sched_init(); 471 472 /* 473 * Create threads to call back and finish configuration for 474 * devices that want interrupts enabled. 475 */ 476 for (i = 0; i < interrupt_config_threads; i++) { 477 (void)kthread_create(PRI_NONE, 0, NULL, 478 config_interrupts_thread, NULL, NULL, "config"); 479 } 480 481 /* Get the threads going and into any sleeps before continuing. */ 482 yield(); 483 484 /* Lock the kernel on behalf of lwp0. */ 485 KERNEL_LOCK(1, NULL); 486 } 487 488 /* 489 * Announce device attach/detach to userland listeners. 490 */ 491 static void 492 devmon_report_device(device_t dev, bool isattach) 493 { 494 #if NDRVCTL > 0 495 prop_dictionary_t ev; 496 const char *parent; 497 const char *what; 498 device_t pdev = device_parent(dev); 499 500 ev = prop_dictionary_create(); 501 if (ev == NULL) 502 return; 503 504 what = (isattach ? "device-attach" : "device-detach"); 505 parent = (pdev == NULL ? "root" : device_xname(pdev)); 506 if (!prop_dictionary_set_cstring(ev, "device", device_xname(dev)) || 507 !prop_dictionary_set_cstring(ev, "parent", parent)) { 508 prop_object_release(ev); 509 return; 510 } 511 512 devmon_insert(what, ev); 513 #endif 514 } 515 516 /* 517 * Add a cfdriver to the system. 518 */ 519 int 520 config_cfdriver_attach(struct cfdriver *cd) 521 { 522 struct cfdriver *lcd; 523 524 /* Make sure this driver isn't already in the system. */ 525 LIST_FOREACH(lcd, &allcfdrivers, cd_list) { 526 if (STREQ(lcd->cd_name, cd->cd_name)) 527 return (EEXIST); 528 } 529 530 LIST_INIT(&cd->cd_attach); 531 LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list); 532 533 return (0); 534 } 535 536 /* 537 * Remove a cfdriver from the system. 538 */ 539 int 540 config_cfdriver_detach(struct cfdriver *cd) 541 { 542 int i; 543 544 /* Make sure there are no active instances. */ 545 for (i = 0; i < cd->cd_ndevs; i++) { 546 if (cd->cd_devs[i] != NULL) 547 return (EBUSY); 548 } 549 550 /* ...and no attachments loaded. */ 551 if (LIST_EMPTY(&cd->cd_attach) == 0) 552 return (EBUSY); 553 554 LIST_REMOVE(cd, cd_list); 555 556 KASSERT(cd->cd_devs == NULL); 557 558 return (0); 559 } 560 561 /* 562 * Look up a cfdriver by name. 563 */ 564 struct cfdriver * 565 config_cfdriver_lookup(const char *name) 566 { 567 struct cfdriver *cd; 568 569 LIST_FOREACH(cd, &allcfdrivers, cd_list) { 570 if (STREQ(cd->cd_name, name)) 571 return (cd); 572 } 573 574 return (NULL); 575 } 576 577 /* 578 * Add a cfattach to the specified driver. 579 */ 580 int 581 config_cfattach_attach(const char *driver, struct cfattach *ca) 582 { 583 struct cfattach *lca; 584 struct cfdriver *cd; 585 586 cd = config_cfdriver_lookup(driver); 587 if (cd == NULL) 588 return (ESRCH); 589 590 /* Make sure this attachment isn't already on this driver. */ 591 LIST_FOREACH(lca, &cd->cd_attach, ca_list) { 592 if (STREQ(lca->ca_name, ca->ca_name)) 593 return (EEXIST); 594 } 595 596 LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list); 597 598 return (0); 599 } 600 601 /* 602 * Remove a cfattach from the specified driver. 603 */ 604 int 605 config_cfattach_detach(const char *driver, struct cfattach *ca) 606 { 607 struct cfdriver *cd; 608 device_t dev; 609 int i; 610 611 cd = config_cfdriver_lookup(driver); 612 if (cd == NULL) 613 return (ESRCH); 614 615 /* Make sure there are no active instances. */ 616 for (i = 0; i < cd->cd_ndevs; i++) { 617 if ((dev = cd->cd_devs[i]) == NULL) 618 continue; 619 if (dev->dv_cfattach == ca) 620 return (EBUSY); 621 } 622 623 LIST_REMOVE(ca, ca_list); 624 625 return (0); 626 } 627 628 /* 629 * Look up a cfattach by name. 630 */ 631 static struct cfattach * 632 config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname) 633 { 634 struct cfattach *ca; 635 636 LIST_FOREACH(ca, &cd->cd_attach, ca_list) { 637 if (STREQ(ca->ca_name, atname)) 638 return (ca); 639 } 640 641 return (NULL); 642 } 643 644 /* 645 * Look up a cfattach by driver/attachment name. 646 */ 647 struct cfattach * 648 config_cfattach_lookup(const char *name, const char *atname) 649 { 650 struct cfdriver *cd; 651 652 cd = config_cfdriver_lookup(name); 653 if (cd == NULL) 654 return (NULL); 655 656 return (config_cfattach_lookup_cd(cd, atname)); 657 } 658 659 /* 660 * Apply the matching function and choose the best. This is used 661 * a few times and we want to keep the code small. 662 */ 663 static void 664 mapply(struct matchinfo *m, cfdata_t cf) 665 { 666 int pri; 667 668 if (m->fn != NULL) { 669 pri = (*m->fn)(m->parent, cf, m->locs, m->aux); 670 } else { 671 pri = config_match(m->parent, cf, m->aux); 672 } 673 if (pri > m->pri) { 674 m->match = cf; 675 m->pri = pri; 676 } 677 } 678 679 int 680 config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux) 681 { 682 const struct cfiattrdata *ci; 683 const struct cflocdesc *cl; 684 int nlocs, i; 685 686 ci = cfiattr_lookup(cf->cf_pspec->cfp_iattr, parent->dv_cfdriver); 687 KASSERT(ci); 688 nlocs = ci->ci_loclen; 689 for (i = 0; i < nlocs; i++) { 690 cl = &ci->ci_locdesc[i]; 691 /* !cld_defaultstr means no default value */ 692 if ((!(cl->cld_defaultstr) 693 || (cf->cf_loc[i] != cl->cld_default)) 694 && cf->cf_loc[i] != locs[i]) 695 return (0); 696 } 697 698 return (config_match(parent, cf, aux)); 699 } 700 701 /* 702 * Helper function: check whether the driver supports the interface attribute 703 * and return its descriptor structure. 704 */ 705 static const struct cfiattrdata * 706 cfdriver_get_iattr(const struct cfdriver *cd, const char *ia) 707 { 708 const struct cfiattrdata * const *cpp; 709 710 if (cd->cd_attrs == NULL) 711 return (0); 712 713 for (cpp = cd->cd_attrs; *cpp; cpp++) { 714 if (STREQ((*cpp)->ci_name, ia)) { 715 /* Match. */ 716 return (*cpp); 717 } 718 } 719 return (0); 720 } 721 722 /* 723 * Lookup an interface attribute description by name. 724 * If the driver is given, consider only its supported attributes. 725 */ 726 const struct cfiattrdata * 727 cfiattr_lookup(const char *name, const struct cfdriver *cd) 728 { 729 const struct cfdriver *d; 730 const struct cfiattrdata *ia; 731 732 if (cd) 733 return (cfdriver_get_iattr(cd, name)); 734 735 LIST_FOREACH(d, &allcfdrivers, cd_list) { 736 ia = cfdriver_get_iattr(d, name); 737 if (ia) 738 return (ia); 739 } 740 return (0); 741 } 742 743 /* 744 * Determine if `parent' is a potential parent for a device spec based 745 * on `cfp'. 746 */ 747 static int 748 cfparent_match(const device_t parent, const struct cfparent *cfp) 749 { 750 struct cfdriver *pcd; 751 752 /* We don't match root nodes here. */ 753 if (cfp == NULL) 754 return (0); 755 756 pcd = parent->dv_cfdriver; 757 KASSERT(pcd != NULL); 758 759 /* 760 * First, ensure this parent has the correct interface 761 * attribute. 762 */ 763 if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr)) 764 return (0); 765 766 /* 767 * If no specific parent device instance was specified (i.e. 768 * we're attaching to the attribute only), we're done! 769 */ 770 if (cfp->cfp_parent == NULL) 771 return (1); 772 773 /* 774 * Check the parent device's name. 775 */ 776 if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0) 777 return (0); /* not the same parent */ 778 779 /* 780 * Make sure the unit number matches. 781 */ 782 if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */ 783 cfp->cfp_unit == parent->dv_unit) 784 return (1); 785 786 /* Unit numbers don't match. */ 787 return (0); 788 } 789 790 /* 791 * Helper for config_cfdata_attach(): check all devices whether it could be 792 * parent any attachment in the config data table passed, and rescan. 793 */ 794 static void 795 rescan_with_cfdata(const struct cfdata *cf) 796 { 797 device_t d; 798 const struct cfdata *cf1; 799 deviter_t di; 800 801 802 /* 803 * "alldevs" is likely longer than an LKM's cfdata, so make it 804 * the outer loop. 805 */ 806 for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) { 807 808 if (!(d->dv_cfattach->ca_rescan)) 809 continue; 810 811 for (cf1 = cf; cf1->cf_name; cf1++) { 812 813 if (!cfparent_match(d, cf1->cf_pspec)) 814 continue; 815 816 (*d->dv_cfattach->ca_rescan)(d, 817 cf1->cf_pspec->cfp_iattr, cf1->cf_loc); 818 } 819 } 820 deviter_release(&di); 821 } 822 823 /* 824 * Attach a supplemental config data table and rescan potential 825 * parent devices if required. 826 */ 827 int 828 config_cfdata_attach(cfdata_t cf, int scannow) 829 { 830 struct cftable *ct; 831 832 ct = malloc(sizeof(struct cftable), M_DEVBUF, M_WAITOK); 833 ct->ct_cfdata = cf; 834 TAILQ_INSERT_TAIL(&allcftables, ct, ct_list); 835 836 if (scannow) 837 rescan_with_cfdata(cf); 838 839 return (0); 840 } 841 842 /* 843 * Helper for config_cfdata_detach: check whether a device is 844 * found through any attachment in the config data table. 845 */ 846 static int 847 dev_in_cfdata(const struct device *d, const struct cfdata *cf) 848 { 849 const struct cfdata *cf1; 850 851 for (cf1 = cf; cf1->cf_name; cf1++) 852 if (d->dv_cfdata == cf1) 853 return (1); 854 855 return (0); 856 } 857 858 /* 859 * Detach a supplemental config data table. Detach all devices found 860 * through that table (and thus keeping references to it) before. 861 */ 862 int 863 config_cfdata_detach(cfdata_t cf) 864 { 865 device_t d; 866 int error = 0; 867 struct cftable *ct; 868 deviter_t di; 869 870 for (d = deviter_first(&di, DEVITER_F_RW); d != NULL; 871 d = deviter_next(&di)) { 872 if (!dev_in_cfdata(d, cf)) 873 continue; 874 if ((error = config_detach(d, 0)) != 0) 875 break; 876 } 877 deviter_release(&di); 878 if (error) { 879 aprint_error_dev(d, "unable to detach instance\n"); 880 return error; 881 } 882 883 TAILQ_FOREACH(ct, &allcftables, ct_list) { 884 if (ct->ct_cfdata == cf) { 885 TAILQ_REMOVE(&allcftables, ct, ct_list); 886 free(ct, M_DEVBUF); 887 return (0); 888 } 889 } 890 891 /* not found -- shouldn't happen */ 892 return (EINVAL); 893 } 894 895 /* 896 * Invoke the "match" routine for a cfdata entry on behalf of 897 * an external caller, usually a "submatch" routine. 898 */ 899 int 900 config_match(device_t parent, cfdata_t cf, void *aux) 901 { 902 struct cfattach *ca; 903 904 ca = config_cfattach_lookup(cf->cf_name, cf->cf_atname); 905 if (ca == NULL) { 906 /* No attachment for this entry, oh well. */ 907 return (0); 908 } 909 910 return ((*ca->ca_match)(parent, cf, aux)); 911 } 912 913 /* 914 * Iterate over all potential children of some device, calling the given 915 * function (default being the child's match function) for each one. 916 * Nonzero returns are matches; the highest value returned is considered 917 * the best match. Return the `found child' if we got a match, or NULL 918 * otherwise. The `aux' pointer is simply passed on through. 919 * 920 * Note that this function is designed so that it can be used to apply 921 * an arbitrary function to all potential children (its return value 922 * can be ignored). 923 */ 924 cfdata_t 925 config_search_loc(cfsubmatch_t fn, device_t parent, 926 const char *ifattr, const int *locs, void *aux) 927 { 928 struct cftable *ct; 929 cfdata_t cf; 930 struct matchinfo m; 931 932 KASSERT(config_initialized); 933 KASSERT(!ifattr || cfdriver_get_iattr(parent->dv_cfdriver, ifattr)); 934 935 m.fn = fn; 936 m.parent = parent; 937 m.locs = locs; 938 m.aux = aux; 939 m.match = NULL; 940 m.pri = 0; 941 942 TAILQ_FOREACH(ct, &allcftables, ct_list) { 943 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 944 945 /* We don't match root nodes here. */ 946 if (!cf->cf_pspec) 947 continue; 948 949 /* 950 * Skip cf if no longer eligible, otherwise scan 951 * through parents for one matching `parent', and 952 * try match function. 953 */ 954 if (cf->cf_fstate == FSTATE_FOUND) 955 continue; 956 if (cf->cf_fstate == FSTATE_DNOTFOUND || 957 cf->cf_fstate == FSTATE_DSTAR) 958 continue; 959 960 /* 961 * If an interface attribute was specified, 962 * consider only children which attach to 963 * that attribute. 964 */ 965 if (ifattr && !STREQ(ifattr, cf->cf_pspec->cfp_iattr)) 966 continue; 967 968 if (cfparent_match(parent, cf->cf_pspec)) 969 mapply(&m, cf); 970 } 971 } 972 return (m.match); 973 } 974 975 cfdata_t 976 config_search_ia(cfsubmatch_t fn, device_t parent, const char *ifattr, 977 void *aux) 978 { 979 980 return (config_search_loc(fn, parent, ifattr, NULL, aux)); 981 } 982 983 /* 984 * Find the given root device. 985 * This is much like config_search, but there is no parent. 986 * Don't bother with multiple cfdata tables; the root node 987 * must always be in the initial table. 988 */ 989 cfdata_t 990 config_rootsearch(cfsubmatch_t fn, const char *rootname, void *aux) 991 { 992 cfdata_t cf; 993 const short *p; 994 struct matchinfo m; 995 996 m.fn = fn; 997 m.parent = ROOT; 998 m.aux = aux; 999 m.match = NULL; 1000 m.pri = 0; 1001 m.locs = 0; 1002 /* 1003 * Look at root entries for matching name. We do not bother 1004 * with found-state here since only one root should ever be 1005 * searched (and it must be done first). 1006 */ 1007 for (p = cfroots; *p >= 0; p++) { 1008 cf = &cfdata[*p]; 1009 if (strcmp(cf->cf_name, rootname) == 0) 1010 mapply(&m, cf); 1011 } 1012 return (m.match); 1013 } 1014 1015 static const char * const msgs[3] = { "", " not configured\n", " unsupported\n" }; 1016 1017 /* 1018 * The given `aux' argument describes a device that has been found 1019 * on the given parent, but not necessarily configured. Locate the 1020 * configuration data for that device (using the submatch function 1021 * provided, or using candidates' cd_match configuration driver 1022 * functions) and attach it, and return true. If the device was 1023 * not configured, call the given `print' function and return 0. 1024 */ 1025 device_t 1026 config_found_sm_loc(device_t parent, 1027 const char *ifattr, const int *locs, void *aux, 1028 cfprint_t print, cfsubmatch_t submatch) 1029 { 1030 cfdata_t cf; 1031 1032 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1033 if (splash_progress_state) 1034 splash_progress_update(splash_progress_state); 1035 #endif 1036 1037 if ((cf = config_search_loc(submatch, parent, ifattr, locs, aux))) 1038 return(config_attach_loc(parent, cf, locs, aux, print)); 1039 if (print) { 1040 if (config_do_twiddle) 1041 twiddle(); 1042 aprint_normal("%s", msgs[(*print)(aux, device_xname(parent))]); 1043 } 1044 1045 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1046 if (splash_progress_state) 1047 splash_progress_update(splash_progress_state); 1048 #endif 1049 1050 return (NULL); 1051 } 1052 1053 device_t 1054 config_found_ia(device_t parent, const char *ifattr, void *aux, 1055 cfprint_t print) 1056 { 1057 1058 return (config_found_sm_loc(parent, ifattr, NULL, aux, print, NULL)); 1059 } 1060 1061 device_t 1062 config_found(device_t parent, void *aux, cfprint_t print) 1063 { 1064 1065 return (config_found_sm_loc(parent, NULL, NULL, aux, print, NULL)); 1066 } 1067 1068 /* 1069 * As above, but for root devices. 1070 */ 1071 device_t 1072 config_rootfound(const char *rootname, void *aux) 1073 { 1074 cfdata_t cf; 1075 1076 if ((cf = config_rootsearch((cfsubmatch_t)NULL, rootname, aux)) != NULL) 1077 return (config_attach(ROOT, cf, aux, (cfprint_t)NULL)); 1078 aprint_error("root device %s not configured\n", rootname); 1079 return (NULL); 1080 } 1081 1082 /* just like sprintf(buf, "%d") except that it works from the end */ 1083 static char * 1084 number(char *ep, int n) 1085 { 1086 1087 *--ep = 0; 1088 while (n >= 10) { 1089 *--ep = (n % 10) + '0'; 1090 n /= 10; 1091 } 1092 *--ep = n + '0'; 1093 return (ep); 1094 } 1095 1096 /* 1097 * Expand the size of the cd_devs array if necessary. 1098 */ 1099 static void 1100 config_makeroom(int n, struct cfdriver *cd) 1101 { 1102 int old, new; 1103 void **nsp; 1104 1105 if (n < cd->cd_ndevs) 1106 return; 1107 1108 /* 1109 * Need to expand the array. 1110 */ 1111 old = cd->cd_ndevs; 1112 if (old == 0) 1113 new = 4; 1114 else 1115 new = old * 2; 1116 while (new <= n) 1117 new *= 2; 1118 cd->cd_ndevs = new; 1119 nsp = malloc(new * sizeof(void *), M_DEVBUF, 1120 cold ? M_NOWAIT : M_WAITOK); 1121 if (nsp == NULL) 1122 panic("config_attach: %sing dev array", 1123 old != 0 ? "expand" : "creat"); 1124 memset(nsp + old, 0, (new - old) * sizeof(void *)); 1125 if (old != 0) { 1126 memcpy(nsp, cd->cd_devs, old * sizeof(void *)); 1127 free(cd->cd_devs, M_DEVBUF); 1128 } 1129 cd->cd_devs = nsp; 1130 } 1131 1132 static void 1133 config_devlink(device_t dev) 1134 { 1135 struct cfdriver *cd = dev->dv_cfdriver; 1136 1137 /* put this device in the devices array */ 1138 config_makeroom(dev->dv_unit, cd); 1139 if (cd->cd_devs[dev->dv_unit]) 1140 panic("config_attach: duplicate %s", device_xname(dev)); 1141 cd->cd_devs[dev->dv_unit] = dev; 1142 1143 /* It is safe to add a device to the tail of the list while 1144 * readers are in the list, but not while a writer is in 1145 * the list. Wait for any writer to complete. 1146 */ 1147 mutex_enter(&alldevs_mtx); 1148 while (alldevs_nwrite != 0 && alldevs_writer != curlwp) 1149 cv_wait(&alldevs_cv, &alldevs_mtx); 1150 TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); /* link up */ 1151 cv_signal(&alldevs_cv); 1152 mutex_exit(&alldevs_mtx); 1153 } 1154 1155 static void 1156 config_devunlink(device_t dev) 1157 { 1158 struct cfdriver *cd = dev->dv_cfdriver; 1159 int i; 1160 1161 /* Unlink from device list. */ 1162 TAILQ_REMOVE(&alldevs, dev, dv_list); 1163 1164 /* Remove from cfdriver's array. */ 1165 cd->cd_devs[dev->dv_unit] = NULL; 1166 1167 /* 1168 * If the device now has no units in use, deallocate its softc array. 1169 */ 1170 for (i = 0; i < cd->cd_ndevs; i++) 1171 if (cd->cd_devs[i] != NULL) 1172 break; 1173 if (i == cd->cd_ndevs) { /* nothing found; deallocate */ 1174 free(cd->cd_devs, M_DEVBUF); 1175 cd->cd_devs = NULL; 1176 cd->cd_ndevs = 0; 1177 } 1178 } 1179 1180 static device_t 1181 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1182 { 1183 struct cfdriver *cd; 1184 struct cfattach *ca; 1185 size_t lname, lunit; 1186 const char *xunit; 1187 int myunit; 1188 char num[10]; 1189 device_t dev; 1190 void *dev_private; 1191 const struct cfiattrdata *ia; 1192 1193 cd = config_cfdriver_lookup(cf->cf_name); 1194 if (cd == NULL) 1195 return (NULL); 1196 1197 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1198 if (ca == NULL) 1199 return (NULL); 1200 1201 if ((ca->ca_flags & DVF_PRIV_ALLOC) == 0 && 1202 ca->ca_devsize < sizeof(struct device)) 1203 panic("config_devalloc: %s", cf->cf_atname); 1204 1205 #ifndef __BROKEN_CONFIG_UNIT_USAGE 1206 if (cf->cf_fstate == FSTATE_STAR) { 1207 for (myunit = cf->cf_unit; myunit < cd->cd_ndevs; myunit++) 1208 if (cd->cd_devs[myunit] == NULL) 1209 break; 1210 /* 1211 * myunit is now the unit of the first NULL device pointer, 1212 * or max(cd->cd_ndevs,cf->cf_unit). 1213 */ 1214 } else { 1215 myunit = cf->cf_unit; 1216 if (myunit < cd->cd_ndevs && cd->cd_devs[myunit] != NULL) 1217 return (NULL); 1218 } 1219 #else 1220 myunit = cf->cf_unit; 1221 #endif /* ! __BROKEN_CONFIG_UNIT_USAGE */ 1222 1223 /* compute length of name and decimal expansion of unit number */ 1224 lname = strlen(cd->cd_name); 1225 xunit = number(&num[sizeof(num)], myunit); 1226 lunit = &num[sizeof(num)] - xunit; 1227 if (lname + lunit > sizeof(dev->dv_xname)) 1228 panic("config_devalloc: device name too long"); 1229 1230 /* get memory for all device vars */ 1231 KASSERT((ca->ca_flags & DVF_PRIV_ALLOC) || ca->ca_devsize >= sizeof(struct device)); 1232 if (ca->ca_devsize > 0) { 1233 dev_private = malloc(ca->ca_devsize, M_DEVBUF, 1234 M_ZERO | (cold ? M_NOWAIT : M_WAITOK)); 1235 if (dev_private == NULL) 1236 panic("config_devalloc: memory allocation for device softc failed"); 1237 } else { 1238 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1239 dev_private = NULL; 1240 } 1241 1242 if ((ca->ca_flags & DVF_PRIV_ALLOC) != 0) { 1243 dev = malloc(sizeof(struct device), M_DEVBUF, 1244 M_ZERO | (cold ? M_NOWAIT : M_WAITOK)); 1245 } else { 1246 dev = dev_private; 1247 } 1248 if (dev == NULL) 1249 panic("config_devalloc: memory allocation for device_t failed"); 1250 1251 dev->dv_class = cd->cd_class; 1252 dev->dv_cfdata = cf; 1253 dev->dv_cfdriver = cd; 1254 dev->dv_cfattach = ca; 1255 dev->dv_unit = myunit; 1256 dev->dv_activity_count = 0; 1257 dev->dv_activity_handlers = NULL; 1258 dev->dv_private = dev_private; 1259 memcpy(dev->dv_xname, cd->cd_name, lname); 1260 memcpy(dev->dv_xname + lname, xunit, lunit); 1261 dev->dv_parent = parent; 1262 if (parent != NULL) 1263 dev->dv_depth = parent->dv_depth + 1; 1264 else 1265 dev->dv_depth = 0; 1266 dev->dv_flags = DVF_ACTIVE; /* always initially active */ 1267 dev->dv_flags |= ca->ca_flags; /* inherit flags from class */ 1268 if (locs) { 1269 KASSERT(parent); /* no locators at root */ 1270 ia = cfiattr_lookup(cf->cf_pspec->cfp_iattr, 1271 parent->dv_cfdriver); 1272 dev->dv_locators = malloc(ia->ci_loclen * sizeof(int), 1273 M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 1274 memcpy(dev->dv_locators, locs, ia->ci_loclen * sizeof(int)); 1275 } 1276 dev->dv_properties = prop_dictionary_create(); 1277 KASSERT(dev->dv_properties != NULL); 1278 1279 prop_dictionary_set_cstring_nocopy(dev->dv_properties, 1280 "device-driver", dev->dv_cfdriver->cd_name); 1281 prop_dictionary_set_uint16(dev->dv_properties, 1282 "device-unit", dev->dv_unit); 1283 1284 return (dev); 1285 } 1286 1287 static void 1288 config_devdealloc(device_t dev) 1289 { 1290 1291 KASSERT(dev->dv_properties != NULL); 1292 prop_object_release(dev->dv_properties); 1293 1294 if (dev->dv_activity_handlers) 1295 panic("config_devdealloc with registered handlers"); 1296 1297 if (dev->dv_locators) 1298 free(dev->dv_locators, M_DEVBUF); 1299 1300 if ((dev->dv_flags & DVF_PRIV_ALLOC) != 0 && dev->dv_private != NULL) 1301 free(dev->dv_private, M_DEVBUF); 1302 1303 free(dev, M_DEVBUF); 1304 } 1305 1306 /* 1307 * Attach a found device. 1308 */ 1309 device_t 1310 config_attach_loc(device_t parent, cfdata_t cf, 1311 const int *locs, void *aux, cfprint_t print) 1312 { 1313 device_t dev; 1314 struct cftable *ct; 1315 const char *drvname; 1316 1317 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1318 if (splash_progress_state) 1319 splash_progress_update(splash_progress_state); 1320 #endif 1321 1322 dev = config_devalloc(parent, cf, locs); 1323 if (!dev) 1324 panic("config_attach: allocation of device softc failed"); 1325 1326 /* XXX redundant - see below? */ 1327 if (cf->cf_fstate != FSTATE_STAR) { 1328 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1329 cf->cf_fstate = FSTATE_FOUND; 1330 } 1331 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1332 else 1333 cf->cf_unit++; 1334 #endif 1335 1336 config_devlink(dev); 1337 1338 if (config_do_twiddle) 1339 twiddle(); 1340 else 1341 aprint_naive("Found "); 1342 /* 1343 * We want the next two printfs for normal, verbose, and quiet, 1344 * but not silent (in which case, we're twiddling, instead). 1345 */ 1346 if (parent == ROOT) { 1347 aprint_naive("%s (root)", device_xname(dev)); 1348 aprint_normal("%s (root)", device_xname(dev)); 1349 } else { 1350 aprint_naive("%s at %s", device_xname(dev), device_xname(parent)); 1351 aprint_normal("%s at %s", device_xname(dev), device_xname(parent)); 1352 if (print) 1353 (void) (*print)(aux, NULL); 1354 } 1355 1356 /* 1357 * Before attaching, clobber any unfound devices that are 1358 * otherwise identical. 1359 * XXX code above is redundant? 1360 */ 1361 drvname = dev->dv_cfdriver->cd_name; 1362 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1363 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1364 if (STREQ(cf->cf_name, drvname) && 1365 cf->cf_unit == dev->dv_unit) { 1366 if (cf->cf_fstate == FSTATE_NOTFOUND) 1367 cf->cf_fstate = FSTATE_FOUND; 1368 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1369 /* 1370 * Bump the unit number on all starred cfdata 1371 * entries for this device. 1372 */ 1373 if (cf->cf_fstate == FSTATE_STAR) 1374 cf->cf_unit++; 1375 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 1376 } 1377 } 1378 } 1379 #ifdef __HAVE_DEVICE_REGISTER 1380 device_register(dev, aux); 1381 #endif 1382 1383 /* Let userland know */ 1384 devmon_report_device(dev, true); 1385 1386 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1387 if (splash_progress_state) 1388 splash_progress_update(splash_progress_state); 1389 #endif 1390 (*dev->dv_cfattach->ca_attach)(parent, dev, aux); 1391 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1392 if (splash_progress_state) 1393 splash_progress_update(splash_progress_state); 1394 #endif 1395 1396 if (!device_pmf_is_registered(dev)) 1397 aprint_debug_dev(dev, "WARNING: power management not supported\n"); 1398 1399 config_process_deferred(&deferred_config_queue, dev); 1400 return (dev); 1401 } 1402 1403 device_t 1404 config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print) 1405 { 1406 1407 return (config_attach_loc(parent, cf, NULL, aux, print)); 1408 } 1409 1410 /* 1411 * As above, but for pseudo-devices. Pseudo-devices attached in this 1412 * way are silently inserted into the device tree, and their children 1413 * attached. 1414 * 1415 * Note that because pseudo-devices are attached silently, any information 1416 * the attach routine wishes to print should be prefixed with the device 1417 * name by the attach routine. 1418 */ 1419 device_t 1420 config_attach_pseudo(cfdata_t cf) 1421 { 1422 device_t dev; 1423 1424 dev = config_devalloc(ROOT, cf, NULL); 1425 if (!dev) 1426 return (NULL); 1427 1428 /* XXX mark busy in cfdata */ 1429 1430 config_devlink(dev); 1431 1432 #if 0 /* XXXJRT not yet */ 1433 #ifdef __HAVE_DEVICE_REGISTER 1434 device_register(dev, NULL); /* like a root node */ 1435 #endif 1436 #endif 1437 (*dev->dv_cfattach->ca_attach)(ROOT, dev, NULL); 1438 config_process_deferred(&deferred_config_queue, dev); 1439 return (dev); 1440 } 1441 1442 /* 1443 * Detach a device. Optionally forced (e.g. because of hardware 1444 * removal) and quiet. Returns zero if successful, non-zero 1445 * (an error code) otherwise. 1446 * 1447 * Note that this code wants to be run from a process context, so 1448 * that the detach can sleep to allow processes which have a device 1449 * open to run and unwind their stacks. 1450 */ 1451 int 1452 config_detach(device_t dev, int flags) 1453 { 1454 struct cftable *ct; 1455 cfdata_t cf; 1456 const struct cfattach *ca; 1457 struct cfdriver *cd; 1458 #ifdef DIAGNOSTIC 1459 device_t d; 1460 #endif 1461 int rv = 0; 1462 1463 #ifdef DIAGNOSTIC 1464 if (dev->dv_cfdata != NULL && 1465 dev->dv_cfdata->cf_fstate != FSTATE_FOUND && 1466 dev->dv_cfdata->cf_fstate != FSTATE_STAR) 1467 panic("config_detach: bad device fstate"); 1468 #endif 1469 cd = dev->dv_cfdriver; 1470 KASSERT(cd != NULL); 1471 1472 ca = dev->dv_cfattach; 1473 KASSERT(ca != NULL); 1474 1475 KASSERT(curlwp != NULL); 1476 mutex_enter(&alldevs_mtx); 1477 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 1478 ; 1479 else while (alldevs_nread != 0 || 1480 (alldevs_nwrite != 0 && alldevs_writer != curlwp)) 1481 cv_wait(&alldevs_cv, &alldevs_mtx); 1482 if (alldevs_nwrite++ == 0) 1483 alldevs_writer = curlwp; 1484 mutex_exit(&alldevs_mtx); 1485 1486 /* 1487 * Ensure the device is deactivated. If the device doesn't 1488 * have an activation entry point, we allow DVF_ACTIVE to 1489 * remain set. Otherwise, if DVF_ACTIVE is still set, the 1490 * device is busy, and the detach fails. 1491 */ 1492 if (ca->ca_activate != NULL) 1493 rv = config_deactivate(dev); 1494 1495 /* 1496 * Try to detach the device. If that's not possible, then 1497 * we either panic() (for the forced but failed case), or 1498 * return an error. 1499 */ 1500 if (rv == 0) { 1501 if (ca->ca_detach != NULL) 1502 rv = (*ca->ca_detach)(dev, flags); 1503 else 1504 rv = EOPNOTSUPP; 1505 } 1506 if (rv != 0) { 1507 if ((flags & DETACH_FORCE) == 0) 1508 goto out; 1509 else 1510 panic("config_detach: forced detach of %s failed (%d)", 1511 device_xname(dev), rv); 1512 } 1513 1514 /* 1515 * The device has now been successfully detached. 1516 */ 1517 1518 /* Let userland know */ 1519 devmon_report_device(dev, false); 1520 1521 #ifdef DIAGNOSTIC 1522 /* 1523 * Sanity: If you're successfully detached, you should have no 1524 * children. (Note that because children must be attached 1525 * after parents, we only need to search the latter part of 1526 * the list.) 1527 */ 1528 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1529 d = TAILQ_NEXT(d, dv_list)) { 1530 if (d->dv_parent == dev) { 1531 printf("config_detach: detached device %s" 1532 " has children %s\n", device_xname(dev), device_xname(d)); 1533 panic("config_detach"); 1534 } 1535 } 1536 #endif 1537 1538 /* notify the parent that the child is gone */ 1539 if (dev->dv_parent) { 1540 device_t p = dev->dv_parent; 1541 if (p->dv_cfattach->ca_childdetached) 1542 (*p->dv_cfattach->ca_childdetached)(p, dev); 1543 } 1544 1545 /* 1546 * Mark cfdata to show that the unit can be reused, if possible. 1547 */ 1548 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1549 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1550 if (STREQ(cf->cf_name, cd->cd_name)) { 1551 if (cf->cf_fstate == FSTATE_FOUND && 1552 cf->cf_unit == dev->dv_unit) 1553 cf->cf_fstate = FSTATE_NOTFOUND; 1554 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1555 /* 1556 * Note that we can only re-use a starred 1557 * unit number if the unit being detached 1558 * had the last assigned unit number. 1559 */ 1560 if (cf->cf_fstate == FSTATE_STAR && 1561 cf->cf_unit == dev->dv_unit + 1) 1562 cf->cf_unit--; 1563 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 1564 } 1565 } 1566 } 1567 1568 config_devunlink(dev); 1569 1570 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1571 aprint_normal_dev(dev, "detached\n"); 1572 1573 config_devdealloc(dev); 1574 1575 out: 1576 mutex_enter(&alldevs_mtx); 1577 if (--alldevs_nwrite == 0) 1578 alldevs_writer = NULL; 1579 cv_signal(&alldevs_cv); 1580 mutex_exit(&alldevs_mtx); 1581 return rv; 1582 } 1583 1584 int 1585 config_detach_children(device_t parent, int flags) 1586 { 1587 device_t dv; 1588 deviter_t di; 1589 int error = 0; 1590 1591 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1592 dv = deviter_next(&di)) { 1593 if (device_parent(dv) != parent) 1594 continue; 1595 if ((error = config_detach(dv, flags)) != 0) 1596 break; 1597 } 1598 deviter_release(&di); 1599 return error; 1600 } 1601 1602 int 1603 config_activate(device_t dev) 1604 { 1605 const struct cfattach *ca = dev->dv_cfattach; 1606 int rv = 0, oflags = dev->dv_flags; 1607 1608 if (ca->ca_activate == NULL) 1609 return (EOPNOTSUPP); 1610 1611 if ((dev->dv_flags & DVF_ACTIVE) == 0) { 1612 dev->dv_flags |= DVF_ACTIVE; 1613 rv = (*ca->ca_activate)(dev, DVACT_ACTIVATE); 1614 if (rv) 1615 dev->dv_flags = oflags; 1616 } 1617 return (rv); 1618 } 1619 1620 int 1621 config_deactivate(device_t dev) 1622 { 1623 const struct cfattach *ca = dev->dv_cfattach; 1624 int rv = 0, oflags = dev->dv_flags; 1625 1626 if (ca->ca_activate == NULL) 1627 return (EOPNOTSUPP); 1628 1629 if (dev->dv_flags & DVF_ACTIVE) { 1630 dev->dv_flags &= ~DVF_ACTIVE; 1631 rv = (*ca->ca_activate)(dev, DVACT_DEACTIVATE); 1632 if (rv) 1633 dev->dv_flags = oflags; 1634 } 1635 return (rv); 1636 } 1637 1638 /* 1639 * Defer the configuration of the specified device until all 1640 * of its parent's devices have been attached. 1641 */ 1642 void 1643 config_defer(device_t dev, void (*func)(device_t)) 1644 { 1645 struct deferred_config *dc; 1646 1647 if (dev->dv_parent == NULL) 1648 panic("config_defer: can't defer config of a root device"); 1649 1650 #ifdef DIAGNOSTIC 1651 for (dc = TAILQ_FIRST(&deferred_config_queue); dc != NULL; 1652 dc = TAILQ_NEXT(dc, dc_queue)) { 1653 if (dc->dc_dev == dev) 1654 panic("config_defer: deferred twice"); 1655 } 1656 #endif 1657 1658 dc = malloc(sizeof(*dc), M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 1659 if (dc == NULL) 1660 panic("config_defer: unable to allocate callback"); 1661 1662 dc->dc_dev = dev; 1663 dc->dc_func = func; 1664 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 1665 config_pending_incr(); 1666 } 1667 1668 /* 1669 * Defer some autoconfiguration for a device until after interrupts 1670 * are enabled. 1671 */ 1672 void 1673 config_interrupts(device_t dev, void (*func)(device_t)) 1674 { 1675 struct deferred_config *dc; 1676 1677 /* 1678 * If interrupts are enabled, callback now. 1679 */ 1680 if (cold == 0) { 1681 (*func)(dev); 1682 return; 1683 } 1684 1685 #ifdef DIAGNOSTIC 1686 for (dc = TAILQ_FIRST(&interrupt_config_queue); dc != NULL; 1687 dc = TAILQ_NEXT(dc, dc_queue)) { 1688 if (dc->dc_dev == dev) 1689 panic("config_interrupts: deferred twice"); 1690 } 1691 #endif 1692 1693 dc = malloc(sizeof(*dc), M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 1694 if (dc == NULL) 1695 panic("config_interrupts: unable to allocate callback"); 1696 1697 dc->dc_dev = dev; 1698 dc->dc_func = func; 1699 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 1700 config_pending_incr(); 1701 } 1702 1703 /* 1704 * Process a deferred configuration queue. 1705 */ 1706 static void 1707 config_process_deferred(struct deferred_config_head *queue, 1708 device_t parent) 1709 { 1710 struct deferred_config *dc, *ndc; 1711 1712 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 1713 ndc = TAILQ_NEXT(dc, dc_queue); 1714 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 1715 TAILQ_REMOVE(queue, dc, dc_queue); 1716 (*dc->dc_func)(dc->dc_dev); 1717 free(dc, M_DEVBUF); 1718 config_pending_decr(); 1719 } 1720 } 1721 } 1722 1723 /* 1724 * Manipulate the config_pending semaphore. 1725 */ 1726 void 1727 config_pending_incr(void) 1728 { 1729 1730 mutex_enter(&config_misc_lock); 1731 config_pending++; 1732 mutex_exit(&config_misc_lock); 1733 } 1734 1735 void 1736 config_pending_decr(void) 1737 { 1738 1739 #ifdef DIAGNOSTIC 1740 if (config_pending == 0) 1741 panic("config_pending_decr: config_pending == 0"); 1742 #endif 1743 mutex_enter(&config_misc_lock); 1744 config_pending--; 1745 if (config_pending == 0) 1746 cv_broadcast(&config_misc_cv); 1747 mutex_exit(&config_misc_lock); 1748 } 1749 1750 /* 1751 * Register a "finalization" routine. Finalization routines are 1752 * called iteratively once all real devices have been found during 1753 * autoconfiguration, for as long as any one finalizer has done 1754 * any work. 1755 */ 1756 int 1757 config_finalize_register(device_t dev, int (*fn)(device_t)) 1758 { 1759 struct finalize_hook *f; 1760 1761 /* 1762 * If finalization has already been done, invoke the 1763 * callback function now. 1764 */ 1765 if (config_finalize_done) { 1766 while ((*fn)(dev) != 0) 1767 /* loop */ ; 1768 } 1769 1770 /* Ensure this isn't already on the list. */ 1771 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 1772 if (f->f_func == fn && f->f_dev == dev) 1773 return (EEXIST); 1774 } 1775 1776 f = malloc(sizeof(*f), M_TEMP, M_WAITOK); 1777 f->f_func = fn; 1778 f->f_dev = dev; 1779 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 1780 1781 return (0); 1782 } 1783 1784 void 1785 config_finalize(void) 1786 { 1787 struct finalize_hook *f; 1788 struct pdevinit *pdev; 1789 extern struct pdevinit pdevinit[]; 1790 int errcnt, rv; 1791 1792 /* 1793 * Now that device driver threads have been created, wait for 1794 * them to finish any deferred autoconfiguration. 1795 */ 1796 mutex_enter(&config_misc_lock); 1797 while (config_pending != 0) 1798 cv_wait(&config_misc_cv, &config_misc_lock); 1799 mutex_exit(&config_misc_lock); 1800 1801 /* Attach pseudo-devices. */ 1802 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 1803 (*pdev->pdev_attach)(pdev->pdev_count); 1804 1805 /* Run the hooks until none of them does any work. */ 1806 do { 1807 rv = 0; 1808 TAILQ_FOREACH(f, &config_finalize_list, f_list) 1809 rv |= (*f->f_func)(f->f_dev); 1810 } while (rv != 0); 1811 1812 config_finalize_done = 1; 1813 1814 /* Now free all the hooks. */ 1815 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 1816 TAILQ_REMOVE(&config_finalize_list, f, f_list); 1817 free(f, M_TEMP); 1818 } 1819 1820 errcnt = aprint_get_error_count(); 1821 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 1822 (boothowto & AB_VERBOSE) == 0) { 1823 if (config_do_twiddle) { 1824 config_do_twiddle = 0; 1825 printf_nolog("done.\n"); 1826 } 1827 if (errcnt != 0) { 1828 printf("WARNING: %d error%s while detecting hardware; " 1829 "check system log.\n", errcnt, 1830 errcnt == 1 ? "" : "s"); 1831 } 1832 } 1833 } 1834 1835 /* 1836 * device_lookup: 1837 * 1838 * Look up a device instance for a given driver. 1839 */ 1840 void * 1841 device_lookup(cfdriver_t cd, int unit) 1842 { 1843 1844 if (unit < 0 || unit >= cd->cd_ndevs) 1845 return (NULL); 1846 1847 return (cd->cd_devs[unit]); 1848 } 1849 1850 /* 1851 * device_lookup: 1852 * 1853 * Look up a device instance for a given driver. 1854 */ 1855 void * 1856 device_lookup_private(cfdriver_t cd, int unit) 1857 { 1858 device_t dv; 1859 1860 if (unit < 0 || unit >= cd->cd_ndevs) 1861 return NULL; 1862 1863 if ((dv = cd->cd_devs[unit]) == NULL) 1864 return NULL; 1865 1866 return dv->dv_private; 1867 } 1868 1869 /* 1870 * Accessor functions for the device_t type. 1871 */ 1872 devclass_t 1873 device_class(device_t dev) 1874 { 1875 1876 return (dev->dv_class); 1877 } 1878 1879 cfdata_t 1880 device_cfdata(device_t dev) 1881 { 1882 1883 return (dev->dv_cfdata); 1884 } 1885 1886 cfdriver_t 1887 device_cfdriver(device_t dev) 1888 { 1889 1890 return (dev->dv_cfdriver); 1891 } 1892 1893 cfattach_t 1894 device_cfattach(device_t dev) 1895 { 1896 1897 return (dev->dv_cfattach); 1898 } 1899 1900 int 1901 device_unit(device_t dev) 1902 { 1903 1904 return (dev->dv_unit); 1905 } 1906 1907 const char * 1908 device_xname(device_t dev) 1909 { 1910 1911 return (dev->dv_xname); 1912 } 1913 1914 device_t 1915 device_parent(device_t dev) 1916 { 1917 1918 return (dev->dv_parent); 1919 } 1920 1921 bool 1922 device_is_active(device_t dev) 1923 { 1924 int active_flags; 1925 1926 active_flags = DVF_ACTIVE; 1927 active_flags |= DVF_CLASS_SUSPENDED; 1928 active_flags |= DVF_DRIVER_SUSPENDED; 1929 active_flags |= DVF_BUS_SUSPENDED; 1930 1931 return ((dev->dv_flags & active_flags) == DVF_ACTIVE); 1932 } 1933 1934 bool 1935 device_is_enabled(device_t dev) 1936 { 1937 return (dev->dv_flags & DVF_ACTIVE) == DVF_ACTIVE; 1938 } 1939 1940 bool 1941 device_has_power(device_t dev) 1942 { 1943 int active_flags; 1944 1945 active_flags = DVF_ACTIVE | DVF_BUS_SUSPENDED; 1946 1947 return ((dev->dv_flags & active_flags) == DVF_ACTIVE); 1948 } 1949 1950 int 1951 device_locator(device_t dev, u_int locnum) 1952 { 1953 1954 KASSERT(dev->dv_locators != NULL); 1955 return (dev->dv_locators[locnum]); 1956 } 1957 1958 void * 1959 device_private(device_t dev) 1960 { 1961 1962 /* 1963 * The reason why device_private(NULL) is allowed is to simplify the 1964 * work of a lot of userspace request handlers (i.e., c/bdev 1965 * handlers) which grab cfdriver_t->cd_units[n]. 1966 * It avoids having them test for it to be NULL and only then calling 1967 * device_private. 1968 */ 1969 return dev == NULL ? NULL : dev->dv_private; 1970 } 1971 1972 prop_dictionary_t 1973 device_properties(device_t dev) 1974 { 1975 1976 return (dev->dv_properties); 1977 } 1978 1979 /* 1980 * device_is_a: 1981 * 1982 * Returns true if the device is an instance of the specified 1983 * driver. 1984 */ 1985 bool 1986 device_is_a(device_t dev, const char *dname) 1987 { 1988 1989 return (strcmp(dev->dv_cfdriver->cd_name, dname) == 0); 1990 } 1991 1992 /* 1993 * device_find_by_xname: 1994 * 1995 * Returns the device of the given name or NULL if it doesn't exist. 1996 */ 1997 device_t 1998 device_find_by_xname(const char *name) 1999 { 2000 device_t dv; 2001 deviter_t di; 2002 2003 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 2004 if (strcmp(device_xname(dv), name) == 0) 2005 break; 2006 } 2007 deviter_release(&di); 2008 2009 return dv; 2010 } 2011 2012 /* 2013 * device_find_by_driver_unit: 2014 * 2015 * Returns the device of the given driver name and unit or 2016 * NULL if it doesn't exist. 2017 */ 2018 device_t 2019 device_find_by_driver_unit(const char *name, int unit) 2020 { 2021 struct cfdriver *cd; 2022 2023 if ((cd = config_cfdriver_lookup(name)) == NULL) 2024 return NULL; 2025 return device_lookup(cd, unit); 2026 } 2027 2028 /* 2029 * Power management related functions. 2030 */ 2031 2032 bool 2033 device_pmf_is_registered(device_t dev) 2034 { 2035 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 2036 } 2037 2038 bool 2039 device_pmf_driver_suspend(device_t dev PMF_FN_ARGS) 2040 { 2041 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2042 return true; 2043 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2044 return false; 2045 if (*dev->dv_driver_suspend != NULL && 2046 !(*dev->dv_driver_suspend)(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_resume(device_t dev PMF_FN_ARGS) 2055 { 2056 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2057 return true; 2058 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2059 return false; 2060 if ((flags & PMF_F_SELF) != 0 && !device_is_self_suspended(dev)) 2061 return false; 2062 if (*dev->dv_driver_resume != NULL && 2063 !(*dev->dv_driver_resume)(dev PMF_FN_CALL)) 2064 return false; 2065 2066 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 2067 return true; 2068 } 2069 2070 bool 2071 device_pmf_driver_shutdown(device_t dev, int how) 2072 { 2073 2074 if (*dev->dv_driver_shutdown != NULL && 2075 !(*dev->dv_driver_shutdown)(dev, how)) 2076 return false; 2077 return true; 2078 } 2079 2080 bool 2081 device_pmf_driver_register(device_t dev, 2082 bool (*suspend)(device_t PMF_FN_PROTO), 2083 bool (*resume)(device_t PMF_FN_PROTO), 2084 bool (*shutdown)(device_t, int)) 2085 { 2086 pmf_private_t *pp; 2087 2088 if ((pp = malloc(sizeof(*pp), M_PMFPRIV, M_NOWAIT|M_ZERO)) == NULL) 2089 return false; 2090 mutex_init(&pp->pp_mtx, MUTEX_DEFAULT, IPL_NONE); 2091 cv_init(&pp->pp_cv, "pmfsusp"); 2092 dev->dv_pmf_private = pp; 2093 2094 dev->dv_driver_suspend = suspend; 2095 dev->dv_driver_resume = resume; 2096 dev->dv_driver_shutdown = shutdown; 2097 dev->dv_flags |= DVF_POWER_HANDLERS; 2098 return true; 2099 } 2100 2101 static const char * 2102 curlwp_name(void) 2103 { 2104 if (curlwp->l_name != NULL) 2105 return curlwp->l_name; 2106 else 2107 return curlwp->l_proc->p_comm; 2108 } 2109 2110 void 2111 device_pmf_driver_deregister(device_t dev) 2112 { 2113 pmf_private_t *pp = dev->dv_pmf_private; 2114 2115 dev->dv_driver_suspend = NULL; 2116 dev->dv_driver_resume = NULL; 2117 2118 dev->dv_pmf_private = NULL; 2119 2120 mutex_enter(&pp->pp_mtx); 2121 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2122 while (pp->pp_nlock > 0 || pp->pp_nwait > 0) { 2123 /* Wake a thread that waits for the lock. That 2124 * thread will fail to acquire the lock, and then 2125 * it will wake the next thread that waits for the 2126 * lock, or else it will wake us. 2127 */ 2128 cv_signal(&pp->pp_cv); 2129 pmflock_debug(dev, __func__, __LINE__); 2130 cv_wait(&pp->pp_cv, &pp->pp_mtx); 2131 pmflock_debug(dev, __func__, __LINE__); 2132 } 2133 mutex_exit(&pp->pp_mtx); 2134 2135 cv_destroy(&pp->pp_cv); 2136 mutex_destroy(&pp->pp_mtx); 2137 free(pp, M_PMFPRIV); 2138 } 2139 2140 bool 2141 device_pmf_driver_child_register(device_t dev) 2142 { 2143 device_t parent = device_parent(dev); 2144 2145 if (parent == NULL || parent->dv_driver_child_register == NULL) 2146 return true; 2147 return (*parent->dv_driver_child_register)(dev); 2148 } 2149 2150 void 2151 device_pmf_driver_set_child_register(device_t dev, 2152 bool (*child_register)(device_t)) 2153 { 2154 dev->dv_driver_child_register = child_register; 2155 } 2156 2157 void 2158 device_pmf_self_resume(device_t dev PMF_FN_ARGS) 2159 { 2160 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2161 if ((dev->dv_flags & DVF_SELF_SUSPENDED) != 0) 2162 dev->dv_flags &= ~DVF_SELF_SUSPENDED; 2163 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2164 } 2165 2166 bool 2167 device_is_self_suspended(device_t dev) 2168 { 2169 return (dev->dv_flags & DVF_SELF_SUSPENDED) != 0; 2170 } 2171 2172 void 2173 device_pmf_self_suspend(device_t dev PMF_FN_ARGS) 2174 { 2175 bool self = (flags & PMF_F_SELF) != 0; 2176 2177 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2178 2179 if (!self) 2180 dev->dv_flags &= ~DVF_SELF_SUSPENDED; 2181 else if (device_is_active(dev)) 2182 dev->dv_flags |= DVF_SELF_SUSPENDED; 2183 2184 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2185 } 2186 2187 static void 2188 pmflock_debug(device_t dev, const char *func, int line) 2189 { 2190 pmf_private_t *pp = device_pmf_private(dev); 2191 2192 aprint_debug_dev(dev, "%s.%d, %s pp_nlock %d pp_nwait %d dv_flags %x\n", 2193 func, line, curlwp_name(), pp->pp_nlock, pp->pp_nwait, 2194 dev->dv_flags); 2195 } 2196 2197 static void 2198 pmflock_debug_with_flags(device_t dev, const char *func, int line PMF_FN_ARGS) 2199 { 2200 pmf_private_t *pp = device_pmf_private(dev); 2201 2202 aprint_debug_dev(dev, "%s.%d, %s pp_nlock %d pp_nwait %d dv_flags %x " 2203 "flags " PMF_FLAGS_FMT "\n", func, line, curlwp_name(), 2204 pp->pp_nlock, pp->pp_nwait, dev->dv_flags PMF_FN_CALL); 2205 } 2206 2207 static bool 2208 device_pmf_lock1(device_t dev PMF_FN_ARGS) 2209 { 2210 pmf_private_t *pp = device_pmf_private(dev); 2211 2212 while (pp->pp_nlock > 0 && pp->pp_holder != curlwp && 2213 device_pmf_is_registered(dev)) { 2214 pp->pp_nwait++; 2215 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2216 cv_wait(&pp->pp_cv, &pp->pp_mtx); 2217 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2218 pp->pp_nwait--; 2219 } 2220 if (!device_pmf_is_registered(dev)) { 2221 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2222 /* We could not acquire the lock, but some other thread may 2223 * wait for it, also. Wake that thread. 2224 */ 2225 cv_signal(&pp->pp_cv); 2226 return false; 2227 } 2228 pp->pp_nlock++; 2229 pp->pp_holder = curlwp; 2230 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2231 return true; 2232 } 2233 2234 bool 2235 device_pmf_lock(device_t dev PMF_FN_ARGS) 2236 { 2237 bool rc; 2238 pmf_private_t *pp = device_pmf_private(dev); 2239 2240 mutex_enter(&pp->pp_mtx); 2241 rc = device_pmf_lock1(dev PMF_FN_CALL); 2242 mutex_exit(&pp->pp_mtx); 2243 2244 return rc; 2245 } 2246 2247 void 2248 device_pmf_unlock(device_t dev PMF_FN_ARGS) 2249 { 2250 pmf_private_t *pp = device_pmf_private(dev); 2251 2252 KASSERT(pp->pp_nlock > 0); 2253 mutex_enter(&pp->pp_mtx); 2254 if (--pp->pp_nlock == 0) 2255 pp->pp_holder = NULL; 2256 cv_signal(&pp->pp_cv); 2257 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2258 mutex_exit(&pp->pp_mtx); 2259 } 2260 2261 void * 2262 device_pmf_private(device_t dev) 2263 { 2264 return dev->dv_pmf_private; 2265 } 2266 2267 void * 2268 device_pmf_bus_private(device_t dev) 2269 { 2270 return dev->dv_bus_private; 2271 } 2272 2273 bool 2274 device_pmf_bus_suspend(device_t dev PMF_FN_ARGS) 2275 { 2276 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2277 return true; 2278 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2279 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2280 return false; 2281 if (*dev->dv_bus_suspend != NULL && 2282 !(*dev->dv_bus_suspend)(dev PMF_FN_CALL)) 2283 return false; 2284 2285 dev->dv_flags |= DVF_BUS_SUSPENDED; 2286 return true; 2287 } 2288 2289 bool 2290 device_pmf_bus_resume(device_t dev PMF_FN_ARGS) 2291 { 2292 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2293 return true; 2294 if ((flags & PMF_F_SELF) != 0 && !device_is_self_suspended(dev)) 2295 return false; 2296 if (*dev->dv_bus_resume != NULL && 2297 !(*dev->dv_bus_resume)(dev PMF_FN_CALL)) 2298 return false; 2299 2300 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2301 return true; 2302 } 2303 2304 bool 2305 device_pmf_bus_shutdown(device_t dev, int how) 2306 { 2307 2308 if (*dev->dv_bus_shutdown != NULL && 2309 !(*dev->dv_bus_shutdown)(dev, how)) 2310 return false; 2311 return true; 2312 } 2313 2314 void 2315 device_pmf_bus_register(device_t dev, void *priv, 2316 bool (*suspend)(device_t PMF_FN_PROTO), 2317 bool (*resume)(device_t PMF_FN_PROTO), 2318 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2319 { 2320 dev->dv_bus_private = priv; 2321 dev->dv_bus_resume = resume; 2322 dev->dv_bus_suspend = suspend; 2323 dev->dv_bus_shutdown = shutdown; 2324 dev->dv_bus_deregister = deregister; 2325 } 2326 2327 void 2328 device_pmf_bus_deregister(device_t dev) 2329 { 2330 if (dev->dv_bus_deregister == NULL) 2331 return; 2332 (*dev->dv_bus_deregister)(dev); 2333 dev->dv_bus_private = NULL; 2334 dev->dv_bus_suspend = NULL; 2335 dev->dv_bus_resume = NULL; 2336 dev->dv_bus_deregister = NULL; 2337 } 2338 2339 void * 2340 device_pmf_class_private(device_t dev) 2341 { 2342 return dev->dv_class_private; 2343 } 2344 2345 bool 2346 device_pmf_class_suspend(device_t dev PMF_FN_ARGS) 2347 { 2348 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2349 return true; 2350 if (*dev->dv_class_suspend != NULL && 2351 !(*dev->dv_class_suspend)(dev PMF_FN_CALL)) 2352 return false; 2353 2354 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2355 return true; 2356 } 2357 2358 bool 2359 device_pmf_class_resume(device_t dev PMF_FN_ARGS) 2360 { 2361 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2362 return true; 2363 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2364 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2365 return false; 2366 if (*dev->dv_class_resume != NULL && 2367 !(*dev->dv_class_resume)(dev PMF_FN_CALL)) 2368 return false; 2369 2370 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2371 return true; 2372 } 2373 2374 void 2375 device_pmf_class_register(device_t dev, void *priv, 2376 bool (*suspend)(device_t PMF_FN_PROTO), 2377 bool (*resume)(device_t PMF_FN_PROTO), 2378 void (*deregister)(device_t)) 2379 { 2380 dev->dv_class_private = priv; 2381 dev->dv_class_suspend = suspend; 2382 dev->dv_class_resume = resume; 2383 dev->dv_class_deregister = deregister; 2384 } 2385 2386 void 2387 device_pmf_class_deregister(device_t dev) 2388 { 2389 if (dev->dv_class_deregister == NULL) 2390 return; 2391 (*dev->dv_class_deregister)(dev); 2392 dev->dv_class_private = NULL; 2393 dev->dv_class_suspend = NULL; 2394 dev->dv_class_resume = NULL; 2395 dev->dv_class_deregister = NULL; 2396 } 2397 2398 bool 2399 device_active(device_t dev, devactive_t type) 2400 { 2401 size_t i; 2402 2403 if (dev->dv_activity_count == 0) 2404 return false; 2405 2406 for (i = 0; i < dev->dv_activity_count; ++i) 2407 (*dev->dv_activity_handlers[i])(dev, type); 2408 2409 return true; 2410 } 2411 2412 bool 2413 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2414 { 2415 void (**new_handlers)(device_t, devactive_t); 2416 void (**old_handlers)(device_t, devactive_t); 2417 size_t i, new_size; 2418 int s; 2419 2420 old_handlers = dev->dv_activity_handlers; 2421 2422 for (i = 0; i < dev->dv_activity_count; ++i) { 2423 if (old_handlers[i] == handler) 2424 panic("Double registering of idle handlers"); 2425 } 2426 2427 new_size = dev->dv_activity_count + 1; 2428 new_handlers = malloc(sizeof(void *) * new_size, M_DEVBUF, M_WAITOK); 2429 2430 memcpy(new_handlers, old_handlers, 2431 sizeof(void *) * dev->dv_activity_count); 2432 new_handlers[new_size - 1] = handler; 2433 2434 s = splhigh(); 2435 dev->dv_activity_count = new_size; 2436 dev->dv_activity_handlers = new_handlers; 2437 splx(s); 2438 2439 if (old_handlers != NULL) 2440 free(old_handlers, M_DEVBUF); 2441 2442 return true; 2443 } 2444 2445 void 2446 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2447 { 2448 void (**new_handlers)(device_t, devactive_t); 2449 void (**old_handlers)(device_t, devactive_t); 2450 size_t i, new_size; 2451 int s; 2452 2453 old_handlers = dev->dv_activity_handlers; 2454 2455 for (i = 0; i < dev->dv_activity_count; ++i) { 2456 if (old_handlers[i] == handler) 2457 break; 2458 } 2459 2460 if (i == dev->dv_activity_count) 2461 return; /* XXX panic? */ 2462 2463 new_size = dev->dv_activity_count - 1; 2464 2465 if (new_size == 0) { 2466 new_handlers = NULL; 2467 } else { 2468 new_handlers = malloc(sizeof(void *) * new_size, M_DEVBUF, 2469 M_WAITOK); 2470 memcpy(new_handlers, old_handlers, sizeof(void *) * i); 2471 memcpy(new_handlers + i, old_handlers + i + 1, 2472 sizeof(void *) * (new_size - i)); 2473 } 2474 2475 s = splhigh(); 2476 dev->dv_activity_count = new_size; 2477 dev->dv_activity_handlers = new_handlers; 2478 splx(s); 2479 2480 free(old_handlers, M_DEVBUF); 2481 } 2482 2483 /* 2484 * Device Iteration 2485 * 2486 * deviter_t: a device iterator. Holds state for a "walk" visiting 2487 * each device_t's in the device tree. 2488 * 2489 * deviter_init(di, flags): initialize the device iterator `di' 2490 * to "walk" the device tree. deviter_next(di) will return 2491 * the first device_t in the device tree, or NULL if there are 2492 * no devices. 2493 * 2494 * `flags' is one or more of DEVITER_F_RW, indicating that the 2495 * caller intends to modify the device tree by calling 2496 * config_detach(9) on devices in the order that the iterator 2497 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2498 * nearest the "root" of the device tree to be returned, first; 2499 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2500 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2501 * indicating both that deviter_init() should not respect any 2502 * locks on the device tree, and that deviter_next(di) may run 2503 * in more than one LWP before the walk has finished. 2504 * 2505 * Only one DEVITER_F_RW iterator may be in the device tree at 2506 * once. 2507 * 2508 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2509 * 2510 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2511 * DEVITER_F_LEAVES_FIRST are used in combination. 2512 * 2513 * deviter_first(di, flags): initialize the device iterator `di' 2514 * and return the first device_t in the device tree, or NULL 2515 * if there are no devices. The statement 2516 * 2517 * dv = deviter_first(di); 2518 * 2519 * is shorthand for 2520 * 2521 * deviter_init(di); 2522 * dv = deviter_next(di); 2523 * 2524 * deviter_next(di): return the next device_t in the device tree, 2525 * or NULL if there are no more devices. deviter_next(di) 2526 * is undefined if `di' was not initialized with deviter_init() or 2527 * deviter_first(). 2528 * 2529 * deviter_release(di): stops iteration (subsequent calls to 2530 * deviter_next() will return NULL), releases any locks and 2531 * resources held by the device iterator. 2532 * 2533 * Device iteration does not return device_t's in any particular 2534 * order. An iterator will never return the same device_t twice. 2535 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2536 * is called repeatedly on the same `di', it will eventually return 2537 * NULL. It is ok to attach/detach devices during device iteration. 2538 */ 2539 void 2540 deviter_init(deviter_t *di, deviter_flags_t flags) 2541 { 2542 device_t dv; 2543 bool rw; 2544 2545 mutex_enter(&alldevs_mtx); 2546 if ((flags & DEVITER_F_SHUTDOWN) != 0) { 2547 flags |= DEVITER_F_RW; 2548 alldevs_nwrite++; 2549 alldevs_writer = NULL; 2550 alldevs_nread = 0; 2551 } else { 2552 rw = (flags & DEVITER_F_RW) != 0; 2553 2554 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 2555 ; 2556 else while ((alldevs_nwrite != 0 && alldevs_writer != curlwp) || 2557 (rw && alldevs_nread != 0)) 2558 cv_wait(&alldevs_cv, &alldevs_mtx); 2559 2560 if (rw) { 2561 if (alldevs_nwrite++ == 0) 2562 alldevs_writer = curlwp; 2563 } else 2564 alldevs_nread++; 2565 } 2566 mutex_exit(&alldevs_mtx); 2567 2568 memset(di, 0, sizeof(*di)); 2569 2570 di->di_flags = flags; 2571 2572 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2573 case DEVITER_F_LEAVES_FIRST: 2574 TAILQ_FOREACH(dv, &alldevs, dv_list) 2575 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2576 break; 2577 case DEVITER_F_ROOT_FIRST: 2578 TAILQ_FOREACH(dv, &alldevs, dv_list) 2579 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2580 break; 2581 default: 2582 break; 2583 } 2584 2585 deviter_reinit(di); 2586 } 2587 2588 static void 2589 deviter_reinit(deviter_t *di) 2590 { 2591 if ((di->di_flags & DEVITER_F_RW) != 0) 2592 di->di_prev = TAILQ_LAST(&alldevs, devicelist); 2593 else 2594 di->di_prev = TAILQ_FIRST(&alldevs); 2595 } 2596 2597 device_t 2598 deviter_first(deviter_t *di, deviter_flags_t flags) 2599 { 2600 deviter_init(di, flags); 2601 return deviter_next(di); 2602 } 2603 2604 static device_t 2605 deviter_next1(deviter_t *di) 2606 { 2607 device_t dv; 2608 2609 dv = di->di_prev; 2610 2611 if (dv == NULL) 2612 ; 2613 else if ((di->di_flags & DEVITER_F_RW) != 0) 2614 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2615 else 2616 di->di_prev = TAILQ_NEXT(dv, dv_list); 2617 2618 return dv; 2619 } 2620 2621 device_t 2622 deviter_next(deviter_t *di) 2623 { 2624 device_t dv = NULL; 2625 2626 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2627 case 0: 2628 return deviter_next1(di); 2629 case DEVITER_F_LEAVES_FIRST: 2630 while (di->di_curdepth >= 0) { 2631 if ((dv = deviter_next1(di)) == NULL) { 2632 di->di_curdepth--; 2633 deviter_reinit(di); 2634 } else if (dv->dv_depth == di->di_curdepth) 2635 break; 2636 } 2637 return dv; 2638 case DEVITER_F_ROOT_FIRST: 2639 while (di->di_curdepth <= di->di_maxdepth) { 2640 if ((dv = deviter_next1(di)) == NULL) { 2641 di->di_curdepth++; 2642 deviter_reinit(di); 2643 } else if (dv->dv_depth == di->di_curdepth) 2644 break; 2645 } 2646 return dv; 2647 default: 2648 return NULL; 2649 } 2650 } 2651 2652 void 2653 deviter_release(deviter_t *di) 2654 { 2655 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 2656 2657 mutex_enter(&alldevs_mtx); 2658 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 2659 --alldevs_nwrite; 2660 else { 2661 2662 if (rw) { 2663 if (--alldevs_nwrite == 0) 2664 alldevs_writer = NULL; 2665 } else 2666 --alldevs_nread; 2667 2668 cv_signal(&alldevs_cv); 2669 } 2670 mutex_exit(&alldevs_mtx); 2671 } 2672
Indexes created Thu Sep 25 16:09:42 GMT 2025