1 /* $NetBSD: subr_autoconf.c,v 1.58 2001/11/12 15:21:46 lukem 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 1.58 2001/11/12 15:21:46 lukem 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 * Attach a found device. Allocates memory for device variables. 329 */ 330 struct device * 331 config_attach(struct device *parent, struct cfdata *cf, void *aux, 332 cfprint_t print) 333 { 334 struct device *dev; 335 struct cfdriver *cd; 336 struct cfattach *ca; 337 size_t lname, lunit; 338 const char *xunit; 339 int myunit; 340 char num[10]; 341 342 cd = cf->cf_driver; 343 ca = cf->cf_attach; 344 if (ca->ca_devsize < sizeof(struct device)) 345 panic("config_attach"); 346 #ifndef __BROKEN_CONFIG_UNIT_USAGE 347 if (cf->cf_fstate == FSTATE_STAR) { 348 for (myunit = cf->cf_unit; myunit < cd->cd_ndevs; myunit++) 349 if (cd->cd_devs[myunit] == NULL) 350 break; 351 /* 352 * myunit is now the unit of the first NULL device pointer, 353 * or max(cd->cd_ndevs,cf->cf_unit). 354 */ 355 } else { 356 myunit = cf->cf_unit; 357 #else /* __BROKEN_CONFIG_UNIT_USAGE */ 358 myunit = cf->cf_unit; 359 if (cf->cf_fstate == FSTATE_STAR) 360 cf->cf_unit++; 361 else { 362 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 363 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 364 cf->cf_fstate = FSTATE_FOUND; 365 } 366 367 /* compute length of name and decimal expansion of unit number */ 368 lname = strlen(cd->cd_name); 369 xunit = number(&num[sizeof(num)], myunit); 370 lunit = &num[sizeof(num)] - xunit; 371 if (lname + lunit >= sizeof(dev->dv_xname)) 372 panic("config_attach: device name too long"); 373 374 /* get memory for all device vars */ 375 dev = (struct device *)malloc(ca->ca_devsize, M_DEVBUF, 376 cold ? M_NOWAIT : M_WAITOK); 377 if (!dev) 378 panic("config_attach: memory allocation for device softc failed"); 379 memset(dev, 0, ca->ca_devsize); 380 TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); /* link up */ 381 dev->dv_class = cd->cd_class; 382 dev->dv_cfdata = cf; 383 dev->dv_unit = myunit; 384 memcpy(dev->dv_xname, cd->cd_name, lname); 385 memcpy(dev->dv_xname + lname, xunit, lunit); 386 dev->dv_parent = parent; 387 dev->dv_flags = DVF_ACTIVE; /* always initially active */ 388 389 if (parent == ROOT) 390 printf("%s (root)", dev->dv_xname); 391 else { 392 printf("%s at %s", dev->dv_xname, parent->dv_xname); 393 if (print) 394 (void) (*print)(aux, NULL); 395 } 396 397 /* put this device in the devices array */ 398 if (dev->dv_unit >= cd->cd_ndevs) { 399 /* 400 * Need to expand the array. 401 */ 402 int old = cd->cd_ndevs, new; 403 void **nsp; 404 405 if (old == 0) 406 new = MINALLOCSIZE / sizeof(void *); 407 else 408 new = old * 2; 409 while (new <= dev->dv_unit) 410 new *= 2; 411 cd->cd_ndevs = new; 412 nsp = malloc(new * sizeof(void *), M_DEVBUF, 413 cold ? M_NOWAIT : M_WAITOK); 414 if (nsp == 0) 415 panic("config_attach: %sing dev array", 416 old != 0 ? "expand" : "creat"); 417 memset(nsp + old, 0, (new - old) * sizeof(void *)); 418 if (old != 0) { 419 memcpy(nsp, cd->cd_devs, old * sizeof(void *)); 420 free(cd->cd_devs, M_DEVBUF); 421 } 422 cd->cd_devs = nsp; 423 } 424 if (cd->cd_devs[dev->dv_unit]) 425 panic("config_attach: duplicate %s", dev->dv_xname); 426 cd->cd_devs[dev->dv_unit] = dev; 427 428 /* 429 * Before attaching, clobber any unfound devices that are 430 * otherwise identical. 431 */ 432 #ifdef __BROKEN_CONFIG_UNIT_USAGE 433 /* bump the unit number on all starred cfdata for this device. */ 434 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 435 for (cf = cfdata; cf->cf_driver; cf++) 436 if (cf->cf_driver == cd && cf->cf_unit == dev->dv_unit) { 437 if (cf->cf_fstate == FSTATE_NOTFOUND) 438 cf->cf_fstate = FSTATE_FOUND; 439 #ifdef __BROKEN_CONFIG_UNIT_USAGE 440 if (cf->cf_fstate == FSTATE_STAR) 441 cf->cf_unit++; 442 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 443 } 444 #ifdef __HAVE_DEVICE_REGISTER 445 device_register(dev, aux); 446 #endif 447 (*ca->ca_attach)(parent, dev, aux); 448 config_process_deferred(&deferred_config_queue, dev); 449 return (dev); 450 } 451 452 /* 453 * Detach a device. Optionally forced (e.g. because of hardware 454 * removal) and quiet. Returns zero if successful, non-zero 455 * (an error code) otherwise. 456 * 457 * Note that this code wants to be run from a process context, so 458 * that the detach can sleep to allow processes which have a device 459 * open to run and unwind their stacks. 460 */ 461 int 462 config_detach(struct device *dev, int flags) 463 { 464 struct cfdata *cf; 465 struct cfattach *ca; 466 struct cfdriver *cd; 467 #ifdef DIAGNOSTIC 468 struct device *d; 469 #endif 470 int rv = 0, i; 471 472 cf = dev->dv_cfdata; 473 #ifdef DIAGNOSTIC 474 if (cf->cf_fstate != FSTATE_FOUND && cf->cf_fstate != FSTATE_STAR) 475 panic("config_detach: bad device fstate"); 476 #endif 477 ca = cf->cf_attach; 478 cd = cf->cf_driver; 479 480 /* 481 * Ensure the device is deactivated. If the device doesn't 482 * have an activation entry point, we allow DVF_ACTIVE to 483 * remain set. Otherwise, if DVF_ACTIVE is still set, the 484 * device is busy, and the detach fails. 485 */ 486 if (ca->ca_activate != NULL) 487 rv = config_deactivate(dev); 488 489 /* 490 * Try to detach the device. If that's not possible, then 491 * we either panic() (for the forced but failed case), or 492 * return an error. 493 */ 494 if (rv == 0) { 495 if (ca->ca_detach != NULL) 496 rv = (*ca->ca_detach)(dev, flags); 497 else 498 rv = EOPNOTSUPP; 499 } 500 if (rv != 0) { 501 if ((flags & DETACH_FORCE) == 0) 502 return (rv); 503 else 504 panic("config_detach: forced detach of %s failed (%d)", 505 dev->dv_xname, rv); 506 } 507 508 /* 509 * The device has now been successfully detached. 510 */ 511 512 #ifdef DIAGNOSTIC 513 /* 514 * Sanity: If you're successfully detached, you should have no 515 * children. (Note that because children must be attached 516 * after parents, we only need to search the latter part of 517 * the list.) 518 */ 519 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 520 d = TAILQ_NEXT(d, dv_list)) { 521 if (d->dv_parent == dev) { 522 printf("config_detach: detached device %s" 523 " has children %s\n", dev->dv_xname, d->dv_xname); 524 panic("config_detach"); 525 } 526 } 527 #endif 528 529 /* 530 * Mark cfdata to show that the unit can be reused, if possible. 531 */ 532 #ifdef __BROKEN_CONFIG_UNIT_USAGE 533 /* 534 * Note that we can only re-use a starred unit number if the unit 535 * being detached had the last assigned unit number. 536 */ 537 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 538 for (cf = cfdata; cf->cf_driver; cf++) { 539 if (cf->cf_driver == cd) { 540 if (cf->cf_fstate == FSTATE_FOUND && 541 cf->cf_unit == dev->dv_unit) 542 cf->cf_fstate = FSTATE_NOTFOUND; 543 #ifdef __BROKEN_CONFIG_UNIT_USAGE 544 if (cf->cf_fstate == FSTATE_STAR && 545 cf->cf_unit == dev->dv_unit + 1) 546 cf->cf_unit--; 547 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 548 } 549 } 550 551 /* 552 * Unlink from device list. 553 */ 554 TAILQ_REMOVE(&alldevs, dev, dv_list); 555 556 /* 557 * Remove from cfdriver's array, tell the world, and free softc. 558 */ 559 cd->cd_devs[dev->dv_unit] = NULL; 560 if ((flags & DETACH_QUIET) == 0) 561 printf("%s detached\n", dev->dv_xname); 562 free(dev, M_DEVBUF); 563 564 /* 565 * If the device now has no units in use, deallocate its softc array. 566 */ 567 for (i = 0; i < cd->cd_ndevs; i++) 568 if (cd->cd_devs[i] != NULL) 569 break; 570 if (i == cd->cd_ndevs) { /* nothing found; deallocate */ 571 free(cd->cd_devs, M_DEVBUF); 572 cd->cd_devs = NULL; 573 cd->cd_ndevs = 0; 574 } 575 576 /* 577 * Return success. 578 */ 579 return (0); 580 } 581 582 int 583 config_activate(struct device *dev) 584 { 585 struct cfattach *ca = dev->dv_cfdata->cf_attach; 586 int rv = 0, oflags = dev->dv_flags; 587 588 if (ca->ca_activate == NULL) 589 return (EOPNOTSUPP); 590 591 if ((dev->dv_flags & DVF_ACTIVE) == 0) { 592 dev->dv_flags |= DVF_ACTIVE; 593 rv = (*ca->ca_activate)(dev, DVACT_ACTIVATE); 594 if (rv) 595 dev->dv_flags = oflags; 596 } 597 return (rv); 598 } 599 600 int 601 config_deactivate(struct device *dev) 602 { 603 struct cfattach *ca = dev->dv_cfdata->cf_attach; 604 int rv = 0, oflags = dev->dv_flags; 605 606 if (ca->ca_activate == NULL) 607 return (EOPNOTSUPP); 608 609 if (dev->dv_flags & DVF_ACTIVE) { 610 dev->dv_flags &= ~DVF_ACTIVE; 611 rv = (*ca->ca_activate)(dev, DVACT_DEACTIVATE); 612 if (rv) 613 dev->dv_flags = oflags; 614 } 615 return (rv); 616 } 617 618 /* 619 * Defer the configuration of the specified device until all 620 * of its parent's devices have been attached. 621 */ 622 void 623 config_defer(struct device *dev, void (*func)(struct device *)) 624 { 625 struct deferred_config *dc; 626 627 if (dev->dv_parent == NULL) 628 panic("config_defer: can't defer config of a root device"); 629 630 #ifdef DIAGNOSTIC 631 for (dc = TAILQ_FIRST(&deferred_config_queue); dc != NULL; 632 dc = TAILQ_NEXT(dc, dc_queue)) { 633 if (dc->dc_dev == dev) 634 panic("config_defer: deferred twice"); 635 } 636 #endif 637 638 dc = malloc(sizeof(*dc), M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 639 if (dc == NULL) 640 panic("config_defer: unable to allocate callback"); 641 642 dc->dc_dev = dev; 643 dc->dc_func = func; 644 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 645 config_pending_incr(); 646 } 647 648 /* 649 * Defer some autoconfiguration for a device until after interrupts 650 * are enabled. 651 */ 652 void 653 config_interrupts(struct device *dev, void (*func)(struct device *)) 654 { 655 struct deferred_config *dc; 656 657 /* 658 * If interrupts are enabled, callback now. 659 */ 660 if (cold == 0) { 661 (*func)(dev); 662 return; 663 } 664 665 #ifdef DIAGNOSTIC 666 for (dc = TAILQ_FIRST(&interrupt_config_queue); dc != NULL; 667 dc = TAILQ_NEXT(dc, dc_queue)) { 668 if (dc->dc_dev == dev) 669 panic("config_interrupts: deferred twice"); 670 } 671 #endif 672 673 dc = malloc(sizeof(*dc), M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 674 if (dc == NULL) 675 panic("config_interrupts: unable to allocate callback"); 676 677 dc->dc_dev = dev; 678 dc->dc_func = func; 679 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 680 config_pending_incr(); 681 } 682 683 /* 684 * Process a deferred configuration queue. 685 */ 686 static void 687 config_process_deferred(struct deferred_config_head *queue, 688 struct device *parent) 689 { 690 struct deferred_config *dc, *ndc; 691 692 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 693 ndc = TAILQ_NEXT(dc, dc_queue); 694 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 695 TAILQ_REMOVE(queue, dc, dc_queue); 696 (*dc->dc_func)(dc->dc_dev); 697 free(dc, M_DEVBUF); 698 config_pending_decr(); 699 } 700 } 701 } 702 703 /* 704 * Manipulate the config_pending semaphore. 705 */ 706 void 707 config_pending_incr(void) 708 { 709 710 config_pending++; 711 } 712 713 void 714 config_pending_decr(void) 715 { 716 717 #ifdef DIAGNOSTIC 718 if (config_pending == 0) 719 panic("config_pending_decr: config_pending == 0"); 720 #endif 721 config_pending--; 722 if (config_pending == 0) 723 wakeup((void *)&config_pending); 724 } 725 726 /* 727 * Attach a statically-initialized event. The type and string pointers 728 * are already set up. 729 */ 730 void 731 evcnt_attach_static(struct evcnt *ev) 732 { 733 int len; 734 735 len = strlen(ev->ev_group); 736 #ifdef DIAGNOSTIC 737 if (len >= EVCNT_STRING_MAX) /* ..._MAX includes NUL */ 738 panic("evcnt_attach_static: group length (%s)", ev->ev_group); 739 #endif 740 ev->ev_grouplen = len; 741 742 len = strlen(ev->ev_name); 743 #ifdef DIAGNOSTIC 744 if (len >= EVCNT_STRING_MAX) /* ..._MAX includes NUL */ 745 panic("evcnt_attach_static: name length (%s)", ev->ev_name); 746 #endif 747 ev->ev_namelen = len; 748 749 TAILQ_INSERT_TAIL(&allevents, ev, ev_list); 750 } 751 752 /* 753 * Attach a dynamically-initialized event. Zero it, set up the type 754 * and string pointers and then act like it was statically initialized. 755 */ 756 void 757 evcnt_attach_dynamic(struct evcnt *ev, int type, const struct evcnt *parent, 758 const char *group, const char *name) 759 { 760 761 memset(ev, 0, sizeof *ev); 762 ev->ev_type = type; 763 ev->ev_parent = parent; 764 ev->ev_group = group; 765 ev->ev_name = name; 766 evcnt_attach_static(ev); 767 } 768 769 /* 770 * Detach an event. 771 */ 772 void 773 evcnt_detach(struct evcnt *ev) 774 { 775 776 TAILQ_REMOVE(&allevents, ev, ev_list); 777 } 778