1 /* $NetBSD: subr_autoconf.c,v 1.61 2001/12/10 00:33:04 thorpej 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. All advertising materials mentioning features or use of this software 59 * must display the following acknowledgement: 60 * This product includes software developed by the University of 61 * California, Berkeley and its contributors. 62 * 4. Neither the name of the University nor the names of its contributors 63 * may be used to endorse or promote products derived from this software 64 * without specific prior written permission. 65 * 66 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 67 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 68 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 69 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 70 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 71 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 72 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 73 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 74 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 75 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 76 * SUCH DAMAGE. 77 * 78 * from: Header: subr_autoconf.c,v 1.12 93/02/01 19:31:48 torek Exp (LBL) 79 * 80 * @(#)subr_autoconf.c 8.3 (Berkeley) 5/17/94 81 */ 82 83 #include <sys/cdefs.h> 84 __KERNEL_RCSID(0, "$NetBSD: subr_autoconf.c,v 1.61 2001/12/10 00:33:04 thorpej Exp $"); 85 86 #include <sys/param.h> 87 #include <sys/device.h> 88 #include <sys/malloc.h> 89 #include <sys/systm.h> 90 #include <sys/kernel.h> 91 #include <sys/errno.h> 92 #include <sys/proc.h> 93 #include <machine/limits.h> 94 95 #include "opt_userconf.h" 96 #ifdef USERCONF 97 #include <sys/userconf.h> 98 #include <sys/reboot.h> 99 #endif 100 101 /* 102 * Autoconfiguration subroutines. 103 */ 104 105 /* 106 * ioconf.c exports exactly two names: cfdata and cfroots. All system 107 * devices and drivers are found via these tables. 108 */ 109 extern struct cfdata cfdata[]; 110 extern short cfroots[]; 111 112 #define ROOT ((struct device *)NULL) 113 114 struct matchinfo { 115 cfmatch_t fn; 116 struct device *parent; 117 void *aux; 118 struct cfdata *match; 119 int pri; 120 }; 121 122 static char *number(char *, int); 123 static void mapply(struct matchinfo *, struct cfdata *); 124 125 struct deferred_config { 126 TAILQ_ENTRY(deferred_config) dc_queue; 127 struct device *dc_dev; 128 void (*dc_func)(struct device *); 129 }; 130 131 TAILQ_HEAD(deferred_config_head, deferred_config); 132 133 struct deferred_config_head deferred_config_queue; 134 struct deferred_config_head interrupt_config_queue; 135 136 static void config_process_deferred(struct deferred_config_head *, 137 struct device *); 138 139 /* list of all devices */ 140 struct devicelist alldevs; 141 142 /* list of all events */ 143 struct evcntlist allevents = TAILQ_HEAD_INITIALIZER(allevents); 144 145 __volatile int config_pending; /* semaphore for mountroot */ 146 147 /* 148 * Configure the system's hardware. 149 */ 150 void 151 configure(void) 152 { 153 154 TAILQ_INIT(&deferred_config_queue); 155 TAILQ_INIT(&interrupt_config_queue); 156 TAILQ_INIT(&alldevs); 157 158 #ifdef USERCONF 159 if (boothowto & RB_USERCONF) 160 user_config(); 161 #endif 162 163 /* 164 * Do the machine-dependent portion of autoconfiguration. This 165 * sets the configuration machinery here in motion by "finding" 166 * the root bus. When this function returns, we expect interrupts 167 * to be enabled. 168 */ 169 cpu_configure(); 170 171 /* 172 * Now that we've found all the hardware, start the real time 173 * and statistics clocks. 174 */ 175 initclocks(); 176 177 cold = 0; /* clocks are running, we're warm now! */ 178 179 /* 180 * Now callback to finish configuration for devices which want 181 * to do this once interrupts are enabled. 182 */ 183 config_process_deferred(&interrupt_config_queue, NULL); 184 } 185 186 /* 187 * Apply the matching function and choose the best. This is used 188 * a few times and we want to keep the code small. 189 */ 190 static void 191 mapply(struct matchinfo *m, struct cfdata *cf) 192 { 193 int pri; 194 195 if (m->fn != NULL) 196 pri = (*m->fn)(m->parent, cf, m->aux); 197 else { 198 if (cf->cf_attach->ca_match == NULL) { 199 panic("mapply: no match function for '%s' device\n", 200 cf->cf_driver->cd_name); 201 } 202 pri = (*cf->cf_attach->ca_match)(m->parent, cf, m->aux); 203 } 204 if (pri > m->pri) { 205 m->match = cf; 206 m->pri = pri; 207 } 208 } 209 210 /* 211 * Iterate over all potential children of some device, calling the given 212 * function (default being the child's match function) for each one. 213 * Nonzero returns are matches; the highest value returned is considered 214 * the best match. Return the `found child' if we got a match, or NULL 215 * otherwise. The `aux' pointer is simply passed on through. 216 * 217 * Note that this function is designed so that it can be used to apply 218 * an arbitrary function to all potential children (its return value 219 * can be ignored). 220 */ 221 struct cfdata * 222 config_search(cfmatch_t fn, struct device *parent, void *aux) 223 { 224 struct cfdata *cf; 225 short *p; 226 struct matchinfo m; 227 228 m.fn = fn; 229 m.parent = parent; 230 m.aux = aux; 231 m.match = NULL; 232 m.pri = 0; 233 for (cf = cfdata; cf->cf_driver; cf++) { 234 /* 235 * Skip cf if no longer eligible, otherwise scan through 236 * parents for one matching `parent', and try match function. 237 */ 238 if (cf->cf_fstate == FSTATE_FOUND) 239 continue; 240 for (p = cf->cf_parents; *p >= 0; p++) 241 if (parent->dv_cfdata == &cfdata[*p]) 242 mapply(&m, cf); 243 } 244 return (m.match); 245 } 246 247 /* 248 * Find the given root device. 249 * This is much like config_search, but there is no parent. 250 */ 251 struct cfdata * 252 config_rootsearch(cfmatch_t fn, const char *rootname, void *aux) 253 { 254 struct cfdata *cf; 255 short *p; 256 struct matchinfo m; 257 258 m.fn = fn; 259 m.parent = ROOT; 260 m.aux = aux; 261 m.match = NULL; 262 m.pri = 0; 263 /* 264 * Look at root entries for matching name. We do not bother 265 * with found-state here since only one root should ever be 266 * searched (and it must be done first). 267 */ 268 for (p = cfroots; *p >= 0; p++) { 269 cf = &cfdata[*p]; 270 if (strcmp(cf->cf_driver->cd_name, rootname) == 0) 271 mapply(&m, cf); 272 } 273 return (m.match); 274 } 275 276 static const char *msgs[3] = { "", " not configured\n", " unsupported\n" }; 277 278 /* 279 * The given `aux' argument describes a device that has been found 280 * on the given parent, but not necessarily configured. Locate the 281 * configuration data for that device (using the submatch function 282 * provided, or using candidates' cd_match configuration driver 283 * functions) and attach it, and return true. If the device was 284 * not configured, call the given `print' function and return 0. 285 */ 286 struct device * 287 config_found_sm(struct device *parent, void *aux, cfprint_t print, 288 cfmatch_t submatch) 289 { 290 struct cfdata *cf; 291 292 if ((cf = config_search(submatch, parent, aux)) != NULL) 293 return (config_attach(parent, cf, aux, print)); 294 if (print) 295 printf("%s", msgs[(*print)(aux, parent->dv_xname)]); 296 return (NULL); 297 } 298 299 /* 300 * As above, but for root devices. 301 */ 302 struct device * 303 config_rootfound(const char *rootname, void *aux) 304 { 305 struct cfdata *cf; 306 307 if ((cf = config_rootsearch((cfmatch_t)NULL, rootname, aux)) != NULL) 308 return (config_attach(ROOT, cf, aux, (cfprint_t)NULL)); 309 printf("root device %s not configured\n", rootname); 310 return (NULL); 311 } 312 313 /* just like sprintf(buf, "%d") except that it works from the end */ 314 static char * 315 number(char *ep, int n) 316 { 317 318 *--ep = 0; 319 while (n >= 10) { 320 *--ep = (n % 10) + '0'; 321 n /= 10; 322 } 323 *--ep = n + '0'; 324 return (ep); 325 } 326 327 /* 328 * Expand the size of the cd_devs array if necessary. 329 */ 330 void 331 config_makeroom(int n, struct cfdriver *cd) 332 { 333 int old, new; 334 void **nsp; 335 336 if (n < cd->cd_ndevs) 337 return; 338 339 /* 340 * Need to expand the array. 341 */ 342 old = cd->cd_ndevs; 343 if (old == 0) 344 new = MINALLOCSIZE / sizeof(void *); 345 else 346 new = old * 2; 347 while (new <= n) 348 new *= 2; 349 cd->cd_ndevs = new; 350 nsp = malloc(new * sizeof(void *), M_DEVBUF, 351 cold ? M_NOWAIT : M_WAITOK); 352 if (nsp == NULL) 353 panic("config_attach: %sing dev array", 354 old != 0 ? "expand" : "creat"); 355 memset(nsp + old, 0, (new - old) * sizeof(void *)); 356 if (old != 0) { 357 memcpy(nsp, cd->cd_devs, old * sizeof(void *)); 358 free(cd->cd_devs, M_DEVBUF); 359 } 360 cd->cd_devs = nsp; 361 } 362 363 /* 364 * Attach a found device. Allocates memory for device variables. 365 */ 366 struct device * 367 config_attach(struct device *parent, struct cfdata *cf, void *aux, 368 cfprint_t print) 369 { 370 struct device *dev; 371 struct cfdriver *cd; 372 struct cfattach *ca; 373 size_t lname, lunit; 374 const char *xunit; 375 int myunit; 376 char num[10]; 377 378 cd = cf->cf_driver; 379 ca = cf->cf_attach; 380 if (ca->ca_devsize < sizeof(struct device)) 381 panic("config_attach"); 382 #ifndef __BROKEN_CONFIG_UNIT_USAGE 383 if (cf->cf_fstate == FSTATE_STAR) { 384 for (myunit = cf->cf_unit; myunit < cd->cd_ndevs; myunit++) 385 if (cd->cd_devs[myunit] == NULL) 386 break; 387 /* 388 * myunit is now the unit of the first NULL device pointer, 389 * or max(cd->cd_ndevs,cf->cf_unit). 390 */ 391 } else { 392 myunit = cf->cf_unit; 393 #else /* __BROKEN_CONFIG_UNIT_USAGE */ 394 myunit = cf->cf_unit; 395 if (cf->cf_fstate == FSTATE_STAR) 396 cf->cf_unit++; 397 else { 398 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 399 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 400 cf->cf_fstate = FSTATE_FOUND; 401 } 402 403 /* compute length of name and decimal expansion of unit number */ 404 lname = strlen(cd->cd_name); 405 xunit = number(&num[sizeof(num)], myunit); 406 lunit = &num[sizeof(num)] - xunit; 407 if (lname + lunit >= sizeof(dev->dv_xname)) 408 panic("config_attach: device name too long"); 409 410 /* get memory for all device vars */ 411 dev = (struct device *)malloc(ca->ca_devsize, M_DEVBUF, 412 cold ? M_NOWAIT : M_WAITOK); 413 if (!dev) 414 panic("config_attach: memory allocation for device softc failed"); 415 memset(dev, 0, ca->ca_devsize); 416 TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); /* link up */ 417 dev->dv_class = cd->cd_class; 418 dev->dv_cfdata = cf; 419 dev->dv_unit = myunit; 420 memcpy(dev->dv_xname, cd->cd_name, lname); 421 memcpy(dev->dv_xname + lname, xunit, lunit); 422 dev->dv_parent = parent; 423 dev->dv_flags = DVF_ACTIVE; /* always initially active */ 424 425 if (parent == ROOT) 426 printf("%s (root)", dev->dv_xname); 427 else { 428 printf("%s at %s", dev->dv_xname, parent->dv_xname); 429 if (print) 430 (void) (*print)(aux, NULL); 431 } 432 433 /* put this device in the devices array */ 434 config_makeroom(dev->dv_unit, cd); 435 if (cd->cd_devs[dev->dv_unit]) 436 panic("config_attach: duplicate %s", dev->dv_xname); 437 cd->cd_devs[dev->dv_unit] = dev; 438 439 /* 440 * Before attaching, clobber any unfound devices that are 441 * otherwise identical. 442 */ 443 #ifdef __BROKEN_CONFIG_UNIT_USAGE 444 /* bump the unit number on all starred cfdata for this device. */ 445 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 446 for (cf = cfdata; cf->cf_driver; cf++) 447 if (cf->cf_driver == cd && cf->cf_unit == dev->dv_unit) { 448 if (cf->cf_fstate == FSTATE_NOTFOUND) 449 cf->cf_fstate = FSTATE_FOUND; 450 #ifdef __BROKEN_CONFIG_UNIT_USAGE 451 if (cf->cf_fstate == FSTATE_STAR) 452 cf->cf_unit++; 453 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 454 } 455 #ifdef __HAVE_DEVICE_REGISTER 456 device_register(dev, aux); 457 #endif 458 (*ca->ca_attach)(parent, dev, aux); 459 config_process_deferred(&deferred_config_queue, dev); 460 return (dev); 461 } 462 463 /* 464 * Detach a device. Optionally forced (e.g. because of hardware 465 * removal) and quiet. Returns zero if successful, non-zero 466 * (an error code) otherwise. 467 * 468 * Note that this code wants to be run from a process context, so 469 * that the detach can sleep to allow processes which have a device 470 * open to run and unwind their stacks. 471 */ 472 int 473 config_detach(struct device *dev, int flags) 474 { 475 struct cfdata *cf; 476 struct cfattach *ca; 477 struct cfdriver *cd; 478 #ifdef DIAGNOSTIC 479 struct device *d; 480 #endif 481 int rv = 0, i; 482 483 cf = dev->dv_cfdata; 484 #ifdef DIAGNOSTIC 485 if (cf->cf_fstate != FSTATE_FOUND && cf->cf_fstate != FSTATE_STAR) 486 panic("config_detach: bad device fstate"); 487 #endif 488 ca = cf->cf_attach; 489 cd = cf->cf_driver; 490 491 /* 492 * Ensure the device is deactivated. If the device doesn't 493 * have an activation entry point, we allow DVF_ACTIVE to 494 * remain set. Otherwise, if DVF_ACTIVE is still set, the 495 * device is busy, and the detach fails. 496 */ 497 if (ca->ca_activate != NULL) 498 rv = config_deactivate(dev); 499 500 /* 501 * Try to detach the device. If that's not possible, then 502 * we either panic() (for the forced but failed case), or 503 * return an error. 504 */ 505 if (rv == 0) { 506 if (ca->ca_detach != NULL) 507 rv = (*ca->ca_detach)(dev, flags); 508 else 509 rv = EOPNOTSUPP; 510 } 511 if (rv != 0) { 512 if ((flags & DETACH_FORCE) == 0) 513 return (rv); 514 else 515 panic("config_detach: forced detach of %s failed (%d)", 516 dev->dv_xname, rv); 517 } 518 519 /* 520 * The device has now been successfully detached. 521 */ 522 523 #ifdef DIAGNOSTIC 524 /* 525 * Sanity: If you're successfully detached, you should have no 526 * children. (Note that because children must be attached 527 * after parents, we only need to search the latter part of 528 * the list.) 529 */ 530 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 531 d = TAILQ_NEXT(d, dv_list)) { 532 if (d->dv_parent == dev) { 533 printf("config_detach: detached device %s" 534 " has children %s\n", dev->dv_xname, d->dv_xname); 535 panic("config_detach"); 536 } 537 } 538 #endif 539 540 /* 541 * Mark cfdata to show that the unit can be reused, if possible. 542 */ 543 #ifdef __BROKEN_CONFIG_UNIT_USAGE 544 /* 545 * Note that we can only re-use a starred unit number if the unit 546 * being detached had the last assigned unit number. 547 */ 548 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 549 for (cf = cfdata; cf->cf_driver; cf++) { 550 if (cf->cf_driver == cd) { 551 if (cf->cf_fstate == FSTATE_FOUND && 552 cf->cf_unit == dev->dv_unit) 553 cf->cf_fstate = FSTATE_NOTFOUND; 554 #ifdef __BROKEN_CONFIG_UNIT_USAGE 555 if (cf->cf_fstate == FSTATE_STAR && 556 cf->cf_unit == dev->dv_unit + 1) 557 cf->cf_unit--; 558 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 559 } 560 } 561 562 /* 563 * Unlink from device list. 564 */ 565 TAILQ_REMOVE(&alldevs, dev, dv_list); 566 567 /* 568 * Remove from cfdriver's array, tell the world, and free softc. 569 */ 570 cd->cd_devs[dev->dv_unit] = NULL; 571 if ((flags & DETACH_QUIET) == 0) 572 printf("%s detached\n", dev->dv_xname); 573 free(dev, M_DEVBUF); 574 575 /* 576 * If the device now has no units in use, deallocate its softc array. 577 */ 578 for (i = 0; i < cd->cd_ndevs; i++) 579 if (cd->cd_devs[i] != NULL) 580 break; 581 if (i == cd->cd_ndevs) { /* nothing found; deallocate */ 582 free(cd->cd_devs, M_DEVBUF); 583 cd->cd_devs = NULL; 584 cd->cd_ndevs = 0; 585 } 586 587 /* 588 * Return success. 589 */ 590 return (0); 591 } 592 593 int 594 config_activate(struct device *dev) 595 { 596 struct cfattach *ca = dev->dv_cfdata->cf_attach; 597 int rv = 0, oflags = dev->dv_flags; 598 599 if (ca->ca_activate == NULL) 600 return (EOPNOTSUPP); 601 602 if ((dev->dv_flags & DVF_ACTIVE) == 0) { 603 dev->dv_flags |= DVF_ACTIVE; 604 rv = (*ca->ca_activate)(dev, DVACT_ACTIVATE); 605 if (rv) 606 dev->dv_flags = oflags; 607 } 608 return (rv); 609 } 610 611 int 612 config_deactivate(struct device *dev) 613 { 614 struct cfattach *ca = dev->dv_cfdata->cf_attach; 615 int rv = 0, oflags = dev->dv_flags; 616 617 if (ca->ca_activate == NULL) 618 return (EOPNOTSUPP); 619 620 if (dev->dv_flags & DVF_ACTIVE) { 621 dev->dv_flags &= ~DVF_ACTIVE; 622 rv = (*ca->ca_activate)(dev, DVACT_DEACTIVATE); 623 if (rv) 624 dev->dv_flags = oflags; 625 } 626 return (rv); 627 } 628 629 /* 630 * Defer the configuration of the specified device until all 631 * of its parent's devices have been attached. 632 */ 633 void 634 config_defer(struct device *dev, void (*func)(struct device *)) 635 { 636 struct deferred_config *dc; 637 638 if (dev->dv_parent == NULL) 639 panic("config_defer: can't defer config of a root device"); 640 641 #ifdef DIAGNOSTIC 642 for (dc = TAILQ_FIRST(&deferred_config_queue); dc != NULL; 643 dc = TAILQ_NEXT(dc, dc_queue)) { 644 if (dc->dc_dev == dev) 645 panic("config_defer: deferred twice"); 646 } 647 #endif 648 649 dc = malloc(sizeof(*dc), M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 650 if (dc == NULL) 651 panic("config_defer: unable to allocate callback"); 652 653 dc->dc_dev = dev; 654 dc->dc_func = func; 655 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 656 config_pending_incr(); 657 } 658 659 /* 660 * Defer some autoconfiguration for a device until after interrupts 661 * are enabled. 662 */ 663 void 664 config_interrupts(struct device *dev, void (*func)(struct device *)) 665 { 666 struct deferred_config *dc; 667 668 /* 669 * If interrupts are enabled, callback now. 670 */ 671 if (cold == 0) { 672 (*func)(dev); 673 return; 674 } 675 676 #ifdef DIAGNOSTIC 677 for (dc = TAILQ_FIRST(&interrupt_config_queue); dc != NULL; 678 dc = TAILQ_NEXT(dc, dc_queue)) { 679 if (dc->dc_dev == dev) 680 panic("config_interrupts: deferred twice"); 681 } 682 #endif 683 684 dc = malloc(sizeof(*dc), M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 685 if (dc == NULL) 686 panic("config_interrupts: unable to allocate callback"); 687 688 dc->dc_dev = dev; 689 dc->dc_func = func; 690 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 691 config_pending_incr(); 692 } 693 694 /* 695 * Process a deferred configuration queue. 696 */ 697 static void 698 config_process_deferred(struct deferred_config_head *queue, 699 struct device *parent) 700 { 701 struct deferred_config *dc, *ndc; 702 703 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 704 ndc = TAILQ_NEXT(dc, dc_queue); 705 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 706 TAILQ_REMOVE(queue, dc, dc_queue); 707 (*dc->dc_func)(dc->dc_dev); 708 free(dc, M_DEVBUF); 709 config_pending_decr(); 710 } 711 } 712 } 713 714 /* 715 * Manipulate the config_pending semaphore. 716 */ 717 void 718 config_pending_incr(void) 719 { 720 721 config_pending++; 722 } 723 724 void 725 config_pending_decr(void) 726 { 727 728 #ifdef DIAGNOSTIC 729 if (config_pending == 0) 730 panic("config_pending_decr: config_pending == 0"); 731 #endif 732 config_pending--; 733 if (config_pending == 0) 734 wakeup((void *)&config_pending); 735 } 736 737 /* 738 * Attach a statically-initialized event. The type and string pointers 739 * are already set up. 740 */ 741 void 742 evcnt_attach_static(struct evcnt *ev) 743 { 744 int len; 745 746 len = strlen(ev->ev_group); 747 #ifdef DIAGNOSTIC 748 if (len >= EVCNT_STRING_MAX) /* ..._MAX includes NUL */ 749 panic("evcnt_attach_static: group length (%s)", ev->ev_group); 750 #endif 751 ev->ev_grouplen = len; 752 753 len = strlen(ev->ev_name); 754 #ifdef DIAGNOSTIC 755 if (len >= EVCNT_STRING_MAX) /* ..._MAX includes NUL */ 756 panic("evcnt_attach_static: name length (%s)", ev->ev_name); 757 #endif 758 ev->ev_namelen = len; 759 760 TAILQ_INSERT_TAIL(&allevents, ev, ev_list); 761 } 762 763 /* 764 * Attach a dynamically-initialized event. Zero it, set up the type 765 * and string pointers and then act like it was statically initialized. 766 */ 767 void 768 evcnt_attach_dynamic(struct evcnt *ev, int type, const struct evcnt *parent, 769 const char *group, const char *name) 770 { 771 772 memset(ev, 0, sizeof *ev); 773 ev->ev_type = type; 774 ev->ev_parent = parent; 775 ev->ev_group = group; 776 ev->ev_name = name; 777 evcnt_attach_static(ev); 778 } 779 780 /* 781 * Detach an event. 782 */ 783 void 784 evcnt_detach(struct evcnt *ev) 785 { 786 787 TAILQ_REMOVE(&allevents, ev, ev_list); 788 } 789