1 /* $NetBSD: subr_autoconf.c,v 1.57 2001/07/01 02:56:20 gmcgarry 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 85 __KERNEL_RCSID(0, "$NetBSD: subr_autoconf.c,v 1.57 2001/07/01 02:56:20 gmcgarry Exp $"); 86 87 #include <sys/param.h> 88 #include <sys/device.h> 89 #include <sys/malloc.h> 90 #include <sys/systm.h> 91 #include <sys/kernel.h> 92 #include <sys/errno.h> 93 #include <sys/proc.h> 94 #include <machine/limits.h> 95 96 #include "opt_userconf.h" 97 #ifdef USERCONF 98 #include <sys/userconf.h> 99 #include <sys/reboot.h> 100 #endif 101 102 /* 103 * Autoconfiguration subroutines. 104 */ 105 106 /* 107 * ioconf.c exports exactly two names: cfdata and cfroots. All system 108 * devices and drivers are found via these tables. 109 */ 110 extern struct cfdata cfdata[]; 111 extern short cfroots[]; 112 113 #define ROOT ((struct device *)NULL) 114 115 struct matchinfo { 116 cfmatch_t fn; 117 struct device *parent; 118 void *aux; 119 struct cfdata *match; 120 int pri; 121 }; 122 123 static char *number(char *, int); 124 static void mapply(struct matchinfo *, struct cfdata *); 125 126 struct deferred_config { 127 TAILQ_ENTRY(deferred_config) dc_queue; 128 struct device *dc_dev; 129 void (*dc_func)(struct device *); 130 }; 131 132 TAILQ_HEAD(deferred_config_head, deferred_config); 133 134 struct deferred_config_head deferred_config_queue; 135 struct deferred_config_head interrupt_config_queue; 136 137 static void config_process_deferred(struct deferred_config_head *, 138 struct device *); 139 140 /* list of all devices */ 141 struct devicelist alldevs; 142 143 /* list of all events */ 144 struct evcntlist allevents = TAILQ_HEAD_INITIALIZER(allevents); 145 146 __volatile int config_pending; /* semaphore for mountroot */ 147 148 /* 149 * Configure the system's hardware. 150 */ 151 void 152 configure(void) 153 { 154 155 TAILQ_INIT(&deferred_config_queue); 156 TAILQ_INIT(&interrupt_config_queue); 157 TAILQ_INIT(&alldevs); 158 159 #ifdef USERCONF 160 if (boothowto & RB_USERCONF) 161 user_config(); 162 #endif 163 164 /* 165 * Do the machine-dependent portion of autoconfiguration. This 166 * sets the configuration machinery here in motion by "finding" 167 * the root bus. When this function returns, we expect interrupts 168 * to be enabled. 169 */ 170 cpu_configure(); 171 172 /* 173 * Now that we've found all the hardware, start the real time 174 * and statistics clocks. 175 */ 176 initclocks(); 177 178 cold = 0; /* clocks are running, we're warm now! */ 179 180 /* 181 * Now callback to finish configuration for devices which want 182 * to do this once interrupts are enabled. 183 */ 184 config_process_deferred(&interrupt_config_queue, NULL); 185 } 186 187 /* 188 * Apply the matching function and choose the best. This is used 189 * a few times and we want to keep the code small. 190 */ 191 static void 192 mapply(struct matchinfo *m, struct cfdata *cf) 193 { 194 int pri; 195 196 if (m->fn != NULL) 197 pri = (*m->fn)(m->parent, cf, m->aux); 198 else { 199 if (cf->cf_attach->ca_match == NULL) { 200 panic("mapply: no match function for '%s' device\n", 201 cf->cf_driver->cd_name); 202 } 203 pri = (*cf->cf_attach->ca_match)(m->parent, cf, m->aux); 204 } 205 if (pri > m->pri) { 206 m->match = cf; 207 m->pri = pri; 208 } 209 } 210 211 /* 212 * Iterate over all potential children of some device, calling the given 213 * function (default being the child's match function) for each one. 214 * Nonzero returns are matches; the highest value returned is considered 215 * the best match. Return the `found child' if we got a match, or NULL 216 * otherwise. The `aux' pointer is simply passed on through. 217 * 218 * Note that this function is designed so that it can be used to apply 219 * an arbitrary function to all potential children (its return value 220 * can be ignored). 221 */ 222 struct cfdata * 223 config_search(cfmatch_t fn, struct device *parent, void *aux) 224 { 225 struct cfdata *cf; 226 short *p; 227 struct matchinfo m; 228 229 m.fn = fn; 230 m.parent = parent; 231 m.aux = aux; 232 m.match = NULL; 233 m.pri = 0; 234 for (cf = cfdata; cf->cf_driver; cf++) { 235 /* 236 * Skip cf if no longer eligible, otherwise scan through 237 * parents for one matching `parent', and try match function. 238 */ 239 if (cf->cf_fstate == FSTATE_FOUND) 240 continue; 241 for (p = cf->cf_parents; *p >= 0; p++) 242 if (parent->dv_cfdata == &cfdata[*p]) 243 mapply(&m, cf); 244 } 245 return (m.match); 246 } 247 248 /* 249 * Find the given root device. 250 * This is much like config_search, but there is no parent. 251 */ 252 struct cfdata * 253 config_rootsearch(cfmatch_t fn, const char *rootname, void *aux) 254 { 255 struct cfdata *cf; 256 short *p; 257 struct matchinfo m; 258 259 m.fn = fn; 260 m.parent = ROOT; 261 m.aux = aux; 262 m.match = NULL; 263 m.pri = 0; 264 /* 265 * Look at root entries for matching name. We do not bother 266 * with found-state here since only one root should ever be 267 * searched (and it must be done first). 268 */ 269 for (p = cfroots; *p >= 0; p++) { 270 cf = &cfdata[*p]; 271 if (strcmp(cf->cf_driver->cd_name, rootname) == 0) 272 mapply(&m, cf); 273 } 274 return (m.match); 275 } 276 277 static const char *msgs[3] = { "", " not configured\n", " unsupported\n" }; 278 279 /* 280 * The given `aux' argument describes a device that has been found 281 * on the given parent, but not necessarily configured. Locate the 282 * configuration data for that device (using the submatch function 283 * provided, or using candidates' cd_match configuration driver 284 * functions) and attach it, and return true. If the device was 285 * not configured, call the given `print' function and return 0. 286 */ 287 struct device * 288 config_found_sm(struct device *parent, void *aux, cfprint_t print, 289 cfmatch_t submatch) 290 { 291 struct cfdata *cf; 292 293 if ((cf = config_search(submatch, parent, aux)) != NULL) 294 return (config_attach(parent, cf, aux, print)); 295 if (print) 296 printf("%s", msgs[(*print)(aux, parent->dv_xname)]); 297 return (NULL); 298 } 299 300 /* 301 * As above, but for root devices. 302 */ 303 struct device * 304 config_rootfound(const char *rootname, void *aux) 305 { 306 struct cfdata *cf; 307 308 if ((cf = config_rootsearch((cfmatch_t)NULL, rootname, aux)) != NULL) 309 return (config_attach(ROOT, cf, aux, (cfprint_t)NULL)); 310 printf("root device %s not configured\n", rootname); 311 return (NULL); 312 } 313 314 /* just like sprintf(buf, "%d") except that it works from the end */ 315 static char * 316 number(char *ep, int n) 317 { 318 319 *--ep = 0; 320 while (n >= 10) { 321 *--ep = (n % 10) + '0'; 322 n /= 10; 323 } 324 *--ep = n + '0'; 325 return (ep); 326 } 327 328 /* 329 * Attach a found device. Allocates memory for device variables. 330 */ 331 struct device * 332 config_attach(struct device *parent, struct cfdata *cf, void *aux, 333 cfprint_t print) 334 { 335 struct device *dev; 336 struct cfdriver *cd; 337 struct cfattach *ca; 338 size_t lname, lunit; 339 const char *xunit; 340 int myunit; 341 char num[10]; 342 343 cd = cf->cf_driver; 344 ca = cf->cf_attach; 345 if (ca->ca_devsize < sizeof(struct device)) 346 panic("config_attach"); 347 #ifndef __BROKEN_CONFIG_UNIT_USAGE 348 if (cf->cf_fstate == FSTATE_STAR) { 349 for (myunit = cf->cf_unit; myunit < cd->cd_ndevs; myunit++) 350 if (cd->cd_devs[myunit] == NULL) 351 break; 352 /* 353 * myunit is now the unit of the first NULL device pointer, 354 * or max(cd->cd_ndevs,cf->cf_unit). 355 */ 356 } else { 357 myunit = cf->cf_unit; 358 #else /* __BROKEN_CONFIG_UNIT_USAGE */ 359 myunit = cf->cf_unit; 360 if (cf->cf_fstate == FSTATE_STAR) 361 cf->cf_unit++; 362 else { 363 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 364 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 365 cf->cf_fstate = FSTATE_FOUND; 366 } 367 368 /* compute length of name and decimal expansion of unit number */ 369 lname = strlen(cd->cd_name); 370 xunit = number(&num[sizeof(num)], myunit); 371 lunit = &num[sizeof(num)] - xunit; 372 if (lname + lunit >= sizeof(dev->dv_xname)) 373 panic("config_attach: device name too long"); 374 375 /* get memory for all device vars */ 376 dev = (struct device *)malloc(ca->ca_devsize, M_DEVBUF, 377 cold ? M_NOWAIT : M_WAITOK); 378 if (!dev) 379 panic("config_attach: memory allocation for device softc failed"); 380 memset(dev, 0, ca->ca_devsize); 381 TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); /* link up */ 382 dev->dv_class = cd->cd_class; 383 dev->dv_cfdata = cf; 384 dev->dv_unit = myunit; 385 memcpy(dev->dv_xname, cd->cd_name, lname); 386 memcpy(dev->dv_xname + lname, xunit, lunit); 387 dev->dv_parent = parent; 388 dev->dv_flags = DVF_ACTIVE; /* always initially active */ 389 390 if (parent == ROOT) 391 printf("%s (root)", dev->dv_xname); 392 else { 393 printf("%s at %s", dev->dv_xname, parent->dv_xname); 394 if (print) 395 (void) (*print)(aux, NULL); 396 } 397 398 /* put this device in the devices array */ 399 if (dev->dv_unit >= cd->cd_ndevs) { 400 /* 401 * Need to expand the array. 402 */ 403 int old = cd->cd_ndevs, new; 404 void **nsp; 405 406 if (old == 0) 407 new = MINALLOCSIZE / sizeof(void *); 408 else 409 new = old * 2; 410 while (new <= dev->dv_unit) 411 new *= 2; 412 cd->cd_ndevs = new; 413 nsp = malloc(new * sizeof(void *), M_DEVBUF, 414 cold ? M_NOWAIT : M_WAITOK); 415 if (nsp == 0) 416 panic("config_attach: %sing dev array", 417 old != 0 ? "expand" : "creat"); 418 memset(nsp + old, 0, (new - old) * sizeof(void *)); 419 if (old != 0) { 420 memcpy(nsp, cd->cd_devs, old * sizeof(void *)); 421 free(cd->cd_devs, M_DEVBUF); 422 } 423 cd->cd_devs = nsp; 424 } 425 if (cd->cd_devs[dev->dv_unit]) 426 panic("config_attach: duplicate %s", dev->dv_xname); 427 cd->cd_devs[dev->dv_unit] = dev; 428 429 /* 430 * Before attaching, clobber any unfound devices that are 431 * otherwise identical. 432 */ 433 #ifdef __BROKEN_CONFIG_UNIT_USAGE 434 /* bump the unit number on all starred cfdata for this device. */ 435 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 436 for (cf = cfdata; cf->cf_driver; cf++) 437 if (cf->cf_driver == cd && cf->cf_unit == dev->dv_unit) { 438 if (cf->cf_fstate == FSTATE_NOTFOUND) 439 cf->cf_fstate = FSTATE_FOUND; 440 #ifdef __BROKEN_CONFIG_UNIT_USAGE 441 if (cf->cf_fstate == FSTATE_STAR) 442 cf->cf_unit++; 443 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 444 } 445 #ifdef __HAVE_DEVICE_REGISTER 446 device_register(dev, aux); 447 #endif 448 (*ca->ca_attach)(parent, dev, aux); 449 config_process_deferred(&deferred_config_queue, dev); 450 return (dev); 451 } 452 453 /* 454 * Detach a device. Optionally forced (e.g. because of hardware 455 * removal) and quiet. Returns zero if successful, non-zero 456 * (an error code) otherwise. 457 * 458 * Note that this code wants to be run from a process context, so 459 * that the detach can sleep to allow processes which have a device 460 * open to run and unwind their stacks. 461 */ 462 int 463 config_detach(struct device *dev, int flags) 464 { 465 struct cfdata *cf; 466 struct cfattach *ca; 467 struct cfdriver *cd; 468 #ifdef DIAGNOSTIC 469 struct device *d; 470 #endif 471 int rv = 0, i; 472 473 cf = dev->dv_cfdata; 474 #ifdef DIAGNOSTIC 475 if (cf->cf_fstate != FSTATE_FOUND && cf->cf_fstate != FSTATE_STAR) 476 panic("config_detach: bad device fstate"); 477 #endif 478 ca = cf->cf_attach; 479 cd = cf->cf_driver; 480 481 /* 482 * Ensure the device is deactivated. If the device doesn't 483 * have an activation entry point, we allow DVF_ACTIVE to 484 * remain set. Otherwise, if DVF_ACTIVE is still set, the 485 * device is busy, and the detach fails. 486 */ 487 if (ca->ca_activate != NULL) 488 rv = config_deactivate(dev); 489 490 /* 491 * Try to detach the device. If that's not possible, then 492 * we either panic() (for the forced but failed case), or 493 * return an error. 494 */ 495 if (rv == 0) { 496 if (ca->ca_detach != NULL) 497 rv = (*ca->ca_detach)(dev, flags); 498 else 499 rv = EOPNOTSUPP; 500 } 501 if (rv != 0) { 502 if ((flags & DETACH_FORCE) == 0) 503 return (rv); 504 else 505 panic("config_detach: forced detach of %s failed (%d)", 506 dev->dv_xname, rv); 507 } 508 509 /* 510 * The device has now been successfully detached. 511 */ 512 513 #ifdef DIAGNOSTIC 514 /* 515 * Sanity: If you're successfully detached, you should have no 516 * children. (Note that because children must be attached 517 * after parents, we only need to search the latter part of 518 * the list.) 519 */ 520 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 521 d = TAILQ_NEXT(d, dv_list)) { 522 if (d->dv_parent == dev) { 523 printf("config_detach: detached device %s" 524 " has children %s\n", dev->dv_xname, d->dv_xname); 525 panic("config_detach"); 526 } 527 } 528 #endif 529 530 /* 531 * Mark cfdata to show that the unit can be reused, if possible. 532 */ 533 #ifdef __BROKEN_CONFIG_UNIT_USAGE 534 /* 535 * Note that we can only re-use a starred unit number if the unit 536 * being detached had the last assigned unit number. 537 */ 538 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 539 for (cf = cfdata; cf->cf_driver; cf++) { 540 if (cf->cf_driver == cd) { 541 if (cf->cf_fstate == FSTATE_FOUND && 542 cf->cf_unit == dev->dv_unit) 543 cf->cf_fstate = FSTATE_NOTFOUND; 544 #ifdef __BROKEN_CONFIG_UNIT_USAGE 545 if (cf->cf_fstate == FSTATE_STAR && 546 cf->cf_unit == dev->dv_unit + 1) 547 cf->cf_unit--; 548 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 549 } 550 } 551 552 /* 553 * Unlink from device list. 554 */ 555 TAILQ_REMOVE(&alldevs, dev, dv_list); 556 557 /* 558 * Remove from cfdriver's array, tell the world, and free softc. 559 */ 560 cd->cd_devs[dev->dv_unit] = NULL; 561 if ((flags & DETACH_QUIET) == 0) 562 printf("%s detached\n", dev->dv_xname); 563 free(dev, M_DEVBUF); 564 565 /* 566 * If the device now has no units in use, deallocate its softc array. 567 */ 568 for (i = 0; i < cd->cd_ndevs; i++) 569 if (cd->cd_devs[i] != NULL) 570 break; 571 if (i == cd->cd_ndevs) { /* nothing found; deallocate */ 572 free(cd->cd_devs, M_DEVBUF); 573 cd->cd_devs = NULL; 574 cd->cd_ndevs = 0; 575 } 576 577 /* 578 * Return success. 579 */ 580 return (0); 581 } 582 583 int 584 config_activate(struct device *dev) 585 { 586 struct cfattach *ca = dev->dv_cfdata->cf_attach; 587 int rv = 0, oflags = dev->dv_flags; 588 589 if (ca->ca_activate == NULL) 590 return (EOPNOTSUPP); 591 592 if ((dev->dv_flags & DVF_ACTIVE) == 0) { 593 dev->dv_flags |= DVF_ACTIVE; 594 rv = (*ca->ca_activate)(dev, DVACT_ACTIVATE); 595 if (rv) 596 dev->dv_flags = oflags; 597 } 598 return (rv); 599 } 600 601 int 602 config_deactivate(struct device *dev) 603 { 604 struct cfattach *ca = dev->dv_cfdata->cf_attach; 605 int rv = 0, oflags = dev->dv_flags; 606 607 if (ca->ca_activate == NULL) 608 return (EOPNOTSUPP); 609 610 if (dev->dv_flags & DVF_ACTIVE) { 611 dev->dv_flags &= ~DVF_ACTIVE; 612 rv = (*ca->ca_activate)(dev, DVACT_DEACTIVATE); 613 if (rv) 614 dev->dv_flags = oflags; 615 } 616 return (rv); 617 } 618 619 /* 620 * Defer the configuration of the specified device until all 621 * of its parent's devices have been attached. 622 */ 623 void 624 config_defer(struct device *dev, void (*func)(struct device *)) 625 { 626 struct deferred_config *dc; 627 628 if (dev->dv_parent == NULL) 629 panic("config_defer: can't defer config of a root device"); 630 631 #ifdef DIAGNOSTIC 632 for (dc = TAILQ_FIRST(&deferred_config_queue); dc != NULL; 633 dc = TAILQ_NEXT(dc, dc_queue)) { 634 if (dc->dc_dev == dev) 635 panic("config_defer: deferred twice"); 636 } 637 #endif 638 639 dc = malloc(sizeof(*dc), M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 640 if (dc == NULL) 641 panic("config_defer: unable to allocate callback"); 642 643 dc->dc_dev = dev; 644 dc->dc_func = func; 645 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 646 config_pending_incr(); 647 } 648 649 /* 650 * Defer some autoconfiguration for a device until after interrupts 651 * are enabled. 652 */ 653 void 654 config_interrupts(struct device *dev, void (*func)(struct device *)) 655 { 656 struct deferred_config *dc; 657 658 /* 659 * If interrupts are enabled, callback now. 660 */ 661 if (cold == 0) { 662 (*func)(dev); 663 return; 664 } 665 666 #ifdef DIAGNOSTIC 667 for (dc = TAILQ_FIRST(&interrupt_config_queue); dc != NULL; 668 dc = TAILQ_NEXT(dc, dc_queue)) { 669 if (dc->dc_dev == dev) 670 panic("config_interrupts: deferred twice"); 671 } 672 #endif 673 674 dc = malloc(sizeof(*dc), M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 675 if (dc == NULL) 676 panic("config_interrupts: unable to allocate callback"); 677 678 dc->dc_dev = dev; 679 dc->dc_func = func; 680 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 681 config_pending_incr(); 682 } 683 684 /* 685 * Process a deferred configuration queue. 686 */ 687 static void 688 config_process_deferred(struct deferred_config_head *queue, 689 struct device *parent) 690 { 691 struct deferred_config *dc, *ndc; 692 693 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 694 ndc = TAILQ_NEXT(dc, dc_queue); 695 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 696 TAILQ_REMOVE(queue, dc, dc_queue); 697 (*dc->dc_func)(dc->dc_dev); 698 free(dc, M_DEVBUF); 699 config_pending_decr(); 700 } 701 } 702 } 703 704 /* 705 * Manipulate the config_pending semaphore. 706 */ 707 void 708 config_pending_incr(void) 709 { 710 711 config_pending++; 712 } 713 714 void 715 config_pending_decr(void) 716 { 717 718 #ifdef DIAGNOSTIC 719 if (config_pending == 0) 720 panic("config_pending_decr: config_pending == 0"); 721 #endif 722 config_pending--; 723 if (config_pending == 0) 724 wakeup((void *)&config_pending); 725 } 726 727 /* 728 * Attach a statically-initialized event. The type and string pointers 729 * are already set up. 730 */ 731 void 732 evcnt_attach_static(struct evcnt *ev) 733 { 734 int len; 735 736 len = strlen(ev->ev_group); 737 #ifdef DIAGNOSTIC 738 if (len >= EVCNT_STRING_MAX) /* ..._MAX includes NUL */ 739 panic("evcnt_attach_static: group length (%s)", ev->ev_group); 740 #endif 741 ev->ev_grouplen = len; 742 743 len = strlen(ev->ev_name); 744 #ifdef DIAGNOSTIC 745 if (len >= EVCNT_STRING_MAX) /* ..._MAX includes NUL */ 746 panic("evcnt_attach_static: name length (%s)", ev->ev_name); 747 #endif 748 ev->ev_namelen = len; 749 750 TAILQ_INSERT_TAIL(&allevents, ev, ev_list); 751 } 752 753 /* 754 * Attach a dynamically-initialized event. Zero it, set up the type 755 * and string pointers and then act like it was statically initialized. 756 */ 757 void 758 evcnt_attach_dynamic(struct evcnt *ev, int type, const struct evcnt *parent, 759 const char *group, const char *name) 760 { 761 762 memset(ev, 0, sizeof *ev); 763 ev->ev_type = type; 764 ev->ev_parent = parent; 765 ev->ev_group = group; 766 ev->ev_name = name; 767 evcnt_attach_static(ev); 768 } 769 770 /* 771 * Detach an event. 772 */ 773 void 774 evcnt_detach(struct evcnt *ev) 775 { 776 777 TAILQ_REMOVE(&allevents, ev, ev_list); 778 } 779