Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_bus.c
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1 /*- 2 * Copyright (c) 1997,1998 Doug Rabson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/queue.h> 31 #include <sys/malloc.h> 32 #include <sys/kernel.h> 33 #include <sys/module.h> 34 #include <sys/bus_private.h> 35 #include <sys/systm.h> 36 #include <machine/stdarg.h> /* for device_printf() */ 37 38 #include "opt_bus.h" 39 40 #ifdef BUS_DEBUG 41 #define PDEBUG(a) (printf(__FUNCTION__ ":%d: ", __LINE__), printf a, printf("\n")) 42 #define DEVICENAME(d) ((d)? device_get_name(d): "no device") 43 #define DRIVERNAME(d) ((d)? d->name : "no driver") 44 #define DEVCLANAME(d) ((d)? d->name : "no devclass") 45 46 /* Produce the indenting, indent*2 spaces plus a '.' ahead of that to 47 * prevent syslog from deleting initial spaces 48 */ 49 #define indentprintf(p) do { int iJ; printf("."); for (iJ=0; iJ<indent; iJ++) printf(" "); printf p ; } while(0) 50 51 static void print_method_list(device_method_t *m, int indent); 52 static void print_device_ops(device_ops_t ops, int indent); 53 static void print_device_short(device_t dev, int indent); 54 static void print_device(device_t dev, int indent); 55 void print_device_tree_short(device_t dev, int indent); 56 void print_device_tree(device_t dev, int indent); 57 static void print_driver_short(driver_t *driver, int indent); 58 static void print_driver(driver_t *driver, int indent); 59 static void print_driver_list(driver_list_t drivers, int indent); 60 static void print_devclass_short(devclass_t dc, int indent); 61 static void print_devclass(devclass_t dc, int indent); 62 void print_devclass_list_short(void); 63 void print_devclass_list(void); 64 65 #else 66 /* Make the compiler ignore the function calls */ 67 #define PDEBUG(a) /* nop */ 68 #define DEVICENAME(d) /* nop */ 69 #define DRIVERNAME(d) /* nop */ 70 #define DEVCLANAME(d) /* nop */ 71 72 #define print_method_list(m,i) /* nop */ 73 #define print_device_ops(o,i) /* nop */ 74 #define print_device_short(d,i) /* nop */ 75 #define print_device(d,i) /* nop */ 76 #define print_device_tree_short(d,i) /* nop */ 77 #define print_device_tree(d,i) /* nop */ 78 #define print_driver_short(d,i) /* nop */ 79 #define print_driver(d,i) /* nop */ 80 #define print_driver_list(d,i) /* nop */ 81 #define print_devclass_short(d,i) /* nop */ 82 #define print_devclass(d,i) /* nop */ 83 #define print_devclass_list_short() /* nop */ 84 #define print_devclass_list() /* nop */ 85 #endif 86 87 88 /* 89 * Method table handling 90 */ 91 static int next_method_offset = 1; 92 static int methods_count = 0; 93 static int methods_size = 0; 94 95 struct method { 96 int offset; 97 char* name; 98 }; 99 100 static struct method *methods = 0; 101 102 static void 103 register_method(struct device_op_desc *desc) 104 { 105 int i; 106 struct method* m; 107 108 for (i = 0; i < methods_count; i++) 109 if (!strcmp(methods[i].name, desc->name)) { 110 desc->offset = methods[i].offset; 111 PDEBUG(("methods[%d] has the same name, %s, with offset %d", 112 i, desc->name, desc->offset)); 113 return; 114 } 115 116 if (methods_count == methods_size) { 117 struct method* p; 118 119 methods_size += 10; 120 p = (struct method*) malloc(methods_size * sizeof(struct method), 121 M_DEVBUF, M_NOWAIT); 122 if (!p) 123 panic("register_method: out of memory"); 124 if (methods) { 125 bcopy(methods, p, methods_count * sizeof(struct method)); 126 free(methods, M_DEVBUF); 127 } 128 methods = p; 129 } 130 m = &methods[methods_count++]; 131 m->name = malloc(strlen(desc->name) + 1, M_DEVBUF, M_NOWAIT); 132 if (!m->name) 133 panic("register_method: out of memory"); 134 strcpy(m->name, desc->name); 135 desc->offset = m->offset = next_method_offset++; 136 } 137 138 static int error_method(void) 139 { 140 return ENXIO; 141 } 142 143 static struct device_ops null_ops = { 144 1, 145 { error_method } 146 }; 147 148 static void 149 compile_methods(driver_t *driver) 150 { 151 device_ops_t ops; 152 struct device_method *m; 153 int i; 154 155 /* 156 * First register any methods which need it. 157 */ 158 for (i = 0, m = driver->methods; m->desc; i++, m++) 159 if (!m->desc->offset) 160 register_method(m->desc); 161 else 162 PDEBUG(("offset not equal to zero, method desc %d left as is", i)); 163 164 /* 165 * Then allocate the compiled op table. 166 */ 167 ops = malloc(sizeof(struct device_ops) + (next_method_offset-1) * sizeof(devop_t), 168 M_DEVBUF, M_NOWAIT); 169 if (!ops) 170 panic("compile_methods: out of memory"); 171 172 ops->maxoffset = next_method_offset; 173 for (i = 0; i < next_method_offset; i++) 174 ops->methods[i] = error_method; 175 for (i = 0, m = driver->methods; m->desc; i++, m++) 176 ops->methods[m->desc->offset] = m->func; 177 PDEBUG(("%s has %d method%s, wasting %d bytes", 178 DRIVERNAME(driver), i, (i==1?"":"s"), 179 (next_method_offset-i)*sizeof(devop_t))); 180 181 driver->ops = ops; 182 } 183 184 /* 185 * Devclass implementation 186 */ 187 188 static devclass_list_t devclasses = TAILQ_HEAD_INITIALIZER(devclasses); 189 190 static devclass_t 191 devclass_find_internal(const char *classname, int create) 192 { 193 devclass_t dc; 194 195 PDEBUG(("looking for %s", classname)); 196 if (!classname) 197 return NULL; 198 199 for (dc = TAILQ_FIRST(&devclasses); dc; dc = TAILQ_NEXT(dc, link)) 200 if (!strcmp(dc->name, classname)) 201 return dc; 202 203 PDEBUG(("%s not found%s", classname, (create? ", creating": ""))); 204 if (create) { 205 dc = malloc(sizeof(struct devclass) + strlen(classname) + 1, 206 M_DEVBUF, M_NOWAIT); 207 if (!dc) 208 return NULL; 209 dc->name = (char*) (dc + 1); 210 strcpy(dc->name, classname); 211 dc->devices = NULL; 212 dc->maxunit = 0; 213 dc->nextunit = 0; 214 TAILQ_INIT(&dc->drivers); 215 TAILQ_INSERT_TAIL(&devclasses, dc, link); 216 } 217 218 return dc; 219 } 220 221 devclass_t 222 devclass_find(const char *classname) 223 { 224 return devclass_find_internal(classname, FALSE); 225 } 226 227 int 228 devclass_add_driver(devclass_t dc, driver_t *driver) 229 { 230 PDEBUG(("%s", DRIVERNAME(driver))); 231 /* 232 * Compile the drivers methods. 233 */ 234 compile_methods(driver); 235 236 /* 237 * Make sure the devclass which the driver is implementing exists. 238 */ 239 devclass_find_internal(driver->name, TRUE); 240 241 TAILQ_INSERT_TAIL(&dc->drivers, driver, link); 242 243 return 0; 244 } 245 246 int 247 devclass_delete_driver(devclass_t busclass, driver_t *driver) 248 { 249 devclass_t dc = devclass_find(driver->name); 250 device_t dev; 251 int i; 252 int error; 253 254 PDEBUG(("%s from devclass %s", driver->name, DEVCLANAME(busclass))); 255 256 if (!dc) 257 return 0; 258 259 /* 260 * Disassociate from any devices. We iterate through all the 261 * devices in the devclass of the driver and detach any which are 262 * using the driver. 263 */ 264 for (i = 0; i < dc->maxunit; i++) { 265 if (dc->devices[i]) { 266 dev = dc->devices[i]; 267 if (dev->driver == driver) { 268 if (error = device_detach(dev)) 269 return error; 270 device_set_driver(dev, NULL); 271 } 272 } 273 } 274 275 TAILQ_REMOVE(&busclass->drivers, driver, link); 276 return 0; 277 } 278 279 driver_t * 280 devclass_find_driver(devclass_t dc, const char *classname) 281 { 282 driver_t *driver; 283 284 PDEBUG(("%s in devclass %s", classname, DEVCLANAME(dc))); 285 286 for (driver = TAILQ_FIRST(&dc->drivers); driver; 287 driver = TAILQ_NEXT(driver, link)) { 288 if (!strcmp(driver->name, classname)) 289 return driver; 290 } 291 292 PDEBUG(("not found")); 293 return NULL; 294 } 295 296 const char * 297 devclass_get_name(devclass_t dc) 298 { 299 return dc->name; 300 } 301 302 device_t 303 devclass_get_device(devclass_t dc, int unit) 304 { 305 if (unit < 0 || unit >= dc->maxunit) 306 return NULL; 307 return dc->devices[unit]; 308 } 309 310 void * 311 devclass_get_softc(devclass_t dc, int unit) 312 { 313 device_t dev; 314 315 if (unit < 0 || unit >= dc->maxunit) 316 return NULL; 317 dev = dc->devices[unit]; 318 if (!dev || dev->state < DS_ATTACHED) 319 return NULL; 320 return dev->softc; 321 } 322 323 int 324 devclass_get_devices(devclass_t dc, device_t **devlistp, int *devcountp) 325 { 326 int i; 327 int count; 328 device_t *list; 329 330 count = 0; 331 for (i = 0; i < dc->maxunit; i++) 332 if (dc->devices[i]) 333 count++; 334 335 list = malloc(count * sizeof(device_t), M_TEMP, M_NOWAIT); 336 if (!list) 337 return ENOMEM; 338 339 count = 0; 340 for (i = 0; i < dc->maxunit; i++) 341 if (dc->devices[i]) { 342 list[count] = dc->devices[i]; 343 count++; 344 } 345 346 *devlistp = list; 347 *devcountp = count; 348 349 return 0; 350 } 351 352 int 353 devclass_get_maxunit(devclass_t dc) 354 { 355 return dc->maxunit; 356 } 357 358 static int 359 devclass_alloc_unit(devclass_t dc, int *unitp) 360 { 361 int unit = *unitp; 362 363 PDEBUG(("unit %d in devclass %s", unit, DEVCLANAME(dc))); 364 365 /* 366 * If we have been given a wired unit number, check for existing 367 * device. 368 */ 369 if (unit != -1) { 370 device_t dev; 371 dev = devclass_get_device(dc, unit); 372 if (dev) { 373 printf("devclass_alloc_unit: %s%d already exists, using next available unit number\n", dc->name, unit); 374 unit = -1; 375 } 376 } 377 378 if (unit == -1) { 379 unit = dc->nextunit; 380 dc->nextunit++; 381 } else if (dc->nextunit <= unit) 382 dc->nextunit = unit + 1; 383 384 if (unit >= dc->maxunit) { 385 device_t *newlist; 386 int newsize; 387 388 newsize = roundup((unit + 1), MINALLOCSIZE / sizeof(device_t)); 389 newlist = malloc(sizeof(device_t) * newsize, M_DEVBUF, M_NOWAIT); 390 if (!newlist) 391 return ENOMEM; 392 bcopy(dc->devices, newlist, sizeof(device_t) * dc->maxunit); 393 bzero(newlist + dc->maxunit, 394 sizeof(device_t) * (newsize - dc->maxunit)); 395 if (dc->devices) 396 free(dc->devices, M_DEVBUF); 397 dc->devices = newlist; 398 dc->maxunit = newsize; 399 } 400 PDEBUG(("now: unit %d in devclass %s", unit, DEVCLANAME(dc))); 401 402 *unitp = unit; 403 return 0; 404 } 405 406 static int 407 devclass_add_device(devclass_t dc, device_t dev) 408 { 409 int error; 410 411 PDEBUG(("%s in devclass %s", DEVICENAME(dev), DEVCLANAME(dc))); 412 413 if (error = devclass_alloc_unit(dc, &dev->unit)) 414 return error; 415 dc->devices[dev->unit] = dev; 416 dev->devclass = dc; 417 return 0; 418 } 419 420 static int 421 devclass_delete_device(devclass_t dc, device_t dev) 422 { 423 if (!dc || !dev) 424 return 0; 425 426 PDEBUG(("%s in devclass %s", DEVICENAME(dev), DEVCLANAME(dc))); 427 428 if (dev->devclass != dc 429 || dc->devices[dev->unit] != dev) 430 panic("devclass_delete_device: inconsistent device class"); 431 dc->devices[dev->unit] = NULL; 432 if (dev->flags & DF_WILDCARD) 433 dev->unit = -1; 434 dev->devclass = NULL; 435 while (dc->nextunit > 0 && dc->devices[dc->nextunit - 1] == NULL) 436 dc->nextunit--; 437 return 0; 438 } 439 440 static device_t 441 make_device(device_t parent, const char *name, 442 int unit, void *ivars) 443 { 444 device_t dev; 445 devclass_t dc; 446 int error; 447 448 PDEBUG(("%s at %s as unit %d with%s ivars", 449 name, DEVICENAME(parent), unit, (ivars? "":"out"))); 450 451 if (name) { 452 dc = devclass_find_internal(name, TRUE); 453 if (!dc) { 454 printf("make_device: can't find device class %s\n", name); 455 return NULL; 456 } 457 458 if (error = devclass_alloc_unit(dc, &unit)) 459 return NULL; 460 } else 461 dc = NULL; 462 463 dev = malloc(sizeof(struct device), M_DEVBUF, M_NOWAIT); 464 if (!dev) 465 return 0; 466 467 dev->parent = parent; 468 TAILQ_INIT(&dev->children); 469 dev->ops = &null_ops; 470 dev->driver = NULL; 471 dev->devclass = dc; 472 dev->unit = unit; 473 dev->desc = NULL; 474 dev->busy = 0; 475 dev->flags = DF_ENABLED; 476 if (unit == -1) 477 dev->flags |= DF_WILDCARD; 478 if (name) 479 dev->flags |= DF_FIXEDCLASS; 480 dev->ivars = ivars; 481 dev->softc = NULL; 482 483 if (dc) 484 dc->devices[unit] = dev; 485 486 dev->state = DS_NOTPRESENT; 487 488 return dev; 489 } 490 491 static void 492 device_print_child(device_t dev, device_t child) 493 { 494 printf("%s%d", device_get_name(child), device_get_unit(child)); 495 if (device_is_alive(child)) { 496 if (device_get_desc(child)) 497 printf(": <%s>", device_get_desc(child)); 498 BUS_PRINT_CHILD(dev, child); 499 } else 500 printf(" not found"); 501 printf("\n"); 502 } 503 504 device_t 505 device_add_child(device_t dev, const char *name, int unit, void *ivars) 506 { 507 device_t child; 508 509 PDEBUG(("%s at %s as unit %d with%s ivars", 510 name, DEVICENAME(dev), unit, (ivars? "":"out"))); 511 512 child = make_device(dev, name, unit, ivars); 513 514 if (child) 515 TAILQ_INSERT_TAIL(&dev->children, child, link); 516 else 517 PDEBUG(("%s failed", name)); 518 519 return child; 520 } 521 522 device_t 523 device_add_child_after(device_t dev, device_t place, const char *name, 524 int unit, void *ivars) 525 { 526 device_t child; 527 528 PDEBUG(("%s at %s after %s as unit %d with%s ivars", 529 name, DEVICENAME(dev), DEVICENAME(place), unit, (ivars? "":"out"))); 530 531 child = make_device(dev, name, unit, ivars); 532 533 if (place) { 534 TAILQ_INSERT_AFTER(&dev->children, place, dev, link); 535 } else { 536 TAILQ_INSERT_HEAD(&dev->children, dev, link); 537 } 538 539 return child; 540 } 541 542 int 543 device_delete_child(device_t dev, device_t child) 544 { 545 int error; 546 device_t grandchild; 547 548 PDEBUG(("%s from %s", DEVICENAME(child), DEVICENAME(dev))); 549 550 /* remove children first */ 551 while ( (grandchild = TAILQ_FIRST(&child->children)) ) { 552 error = device_delete_child(child, grandchild); 553 if (error) 554 return error; 555 } 556 557 if (error = device_detach(child)) 558 return error; 559 if (child->devclass) 560 devclass_delete_device(child->devclass, child); 561 TAILQ_REMOVE(&dev->children, child, link); 562 free(child, M_DEVBUF); 563 564 return 0; 565 } 566 567 /* 568 * Find only devices attached to this bus. 569 */ 570 device_t 571 device_find_child(device_t dev, const char *classname, int unit) 572 { 573 devclass_t dc; 574 device_t child; 575 576 dc = devclass_find(classname); 577 if (!dc) 578 return NULL; 579 580 child = devclass_get_device(dc, unit); 581 if (child && child->parent == dev) 582 return child; 583 return NULL; 584 } 585 586 static driver_t * 587 first_matching_driver(devclass_t dc, device_t dev) 588 { 589 if (dev->devclass) 590 return devclass_find_driver(dc, dev->devclass->name); 591 else 592 return TAILQ_FIRST(&dc->drivers); 593 } 594 595 static driver_t * 596 next_matching_driver(devclass_t dc, device_t dev, driver_t *last) 597 { 598 if (dev->devclass) { 599 driver_t *driver; 600 for (driver = TAILQ_NEXT(last, link); driver; 601 driver = TAILQ_NEXT(driver, link)) 602 if (!strcmp(dev->devclass->name, driver->name)) 603 return driver; 604 return NULL; 605 } else 606 return TAILQ_NEXT(last, link); 607 } 608 609 static int 610 device_probe_child(device_t dev, device_t child) 611 { 612 devclass_t dc; 613 driver_t *driver; 614 615 dc = dev->devclass; 616 if (dc == NULL) 617 panic("device_probe_child: parent device has no devclass"); 618 619 if (child->state == DS_ALIVE) 620 return 0; 621 622 for (driver = first_matching_driver(dc, child); 623 driver; 624 driver = next_matching_driver(dc, child, driver)) { 625 PDEBUG(("Trying %s", DRIVERNAME(driver))); 626 device_set_driver(child, driver); 627 if (DEVICE_PROBE(child) == 0) { 628 if (!child->devclass) 629 device_set_devclass(child, driver->name); 630 child->state = DS_ALIVE; 631 return 0; 632 } 633 } 634 635 return ENXIO; 636 } 637 638 device_t 639 device_get_parent(device_t dev) 640 { 641 return dev->parent; 642 } 643 644 int 645 device_get_children(device_t dev, device_t **devlistp, int *devcountp) 646 { 647 int count; 648 device_t child; 649 device_t *list; 650 651 count = 0; 652 for (child = TAILQ_FIRST(&dev->children); child; 653 child = TAILQ_NEXT(child, link)) 654 count++; 655 656 list = malloc(count * sizeof(device_t), M_TEMP, M_NOWAIT); 657 if (!list) 658 return ENOMEM; 659 660 count = 0; 661 for (child = TAILQ_FIRST(&dev->children); child; 662 child = TAILQ_NEXT(child, link)) { 663 list[count] = child; 664 count++; 665 } 666 667 *devlistp = list; 668 *devcountp = count; 669 670 return 0; 671 } 672 673 driver_t * 674 device_get_driver(device_t dev) 675 { 676 return dev->driver; 677 } 678 679 devclass_t 680 device_get_devclass(device_t dev) 681 { 682 return dev->devclass; 683 } 684 685 const char * 686 device_get_name(device_t dev) 687 { 688 if (dev->devclass) 689 return devclass_get_name(dev->devclass); 690 return NULL; 691 } 692 693 int 694 device_get_unit(device_t dev) 695 { 696 return dev->unit; 697 } 698 699 const char * 700 device_get_desc(device_t dev) 701 { 702 return dev->desc; 703 } 704 705 void 706 device_print_prettyname(device_t dev) 707 { 708 const char *name = device_get_name(dev); 709 710 if (name == 0) 711 name = "(no driver assigned)"; 712 printf("%s%d: ", name, device_get_unit(dev)); 713 } 714 715 void 716 device_printf(device_t dev, const char * fmt, ...) 717 { 718 va_list ap; 719 720 device_print_prettyname(dev); 721 va_start(ap, fmt); 722 vprintf(fmt, ap); 723 va_end(ap); 724 } 725 726 void 727 device_set_desc(device_t dev, const char* desc) 728 { 729 dev->desc = desc; 730 } 731 732 void * 733 device_get_softc(device_t dev) 734 { 735 return dev->softc; 736 } 737 738 void * 739 device_get_ivars(device_t dev) 740 { 741 return dev->ivars; 742 } 743 744 device_state_t 745 device_get_state(device_t dev) 746 { 747 return dev->state; 748 } 749 750 void 751 device_enable(device_t dev) 752 { 753 dev->flags |= DF_ENABLED; 754 } 755 756 void 757 device_disable(device_t dev) 758 { 759 dev->flags &= ~DF_ENABLED; 760 } 761 762 void 763 device_busy(device_t dev) 764 { 765 if (dev->state < DS_ATTACHED) 766 panic("device_busy: called for unattached device"); 767 if (dev->busy == 0 && dev->parent) 768 device_busy(dev->parent); 769 dev->busy++; 770 dev->state = DS_BUSY; 771 } 772 773 void 774 device_unbusy(device_t dev) 775 { 776 if (dev->state != DS_BUSY) 777 panic("device_unbusy: called for non-busy device"); 778 dev->busy--; 779 if (dev->busy == 0) { 780 if (dev->parent) 781 device_unbusy(dev->parent); 782 dev->state = DS_ATTACHED; 783 } 784 } 785 786 int 787 device_is_enabled(device_t dev) 788 { 789 return (dev->flags & DF_ENABLED) != 0; 790 } 791 792 int 793 device_is_alive(device_t dev) 794 { 795 return dev->state >= DS_ALIVE; 796 } 797 798 int 799 device_set_devclass(device_t dev, const char *classname) 800 { 801 devclass_t dc; 802 803 if (dev->devclass) { 804 printf("device_set_devclass: device class already set\n"); 805 return EINVAL; 806 } 807 808 dc = devclass_find_internal(classname, TRUE); 809 if (!dc) 810 return ENOMEM; 811 812 return devclass_add_device(dc, dev); 813 } 814 815 int 816 device_set_driver(device_t dev, driver_t *driver) 817 { 818 if (dev->state >= DS_ATTACHED) 819 return EBUSY; 820 821 if (dev->driver == driver) 822 return 0; 823 824 if (dev->softc) { 825 free(dev->softc, M_DEVBUF); 826 dev->softc = NULL; 827 } 828 dev->ops = &null_ops; 829 dev->driver = driver; 830 if (driver) { 831 dev->ops = driver->ops; 832 dev->softc = malloc(driver->softc, M_DEVBUF, M_NOWAIT); 833 if (!dev->softc) { 834 dev->ops = &null_ops; 835 dev->driver = NULL; 836 return ENOMEM; 837 } 838 bzero(dev->softc, driver->softc); 839 } 840 return 0; 841 } 842 843 int 844 device_probe_and_attach(device_t dev) 845 { 846 device_t bus = dev->parent; 847 int error = 0; 848 849 if (dev->state >= DS_ALIVE) 850 return 0; 851 852 if (dev->flags & DF_ENABLED) { 853 error = device_probe_child(bus, dev); 854 if (!error) { 855 device_print_child(bus, dev); 856 error = DEVICE_ATTACH(dev); 857 if (!error) 858 dev->state = DS_ATTACHED; 859 else { 860 printf("device_probe_and_attach: %s%d attach returned %d\n", 861 dev->driver->name, dev->unit, error); 862 device_set_driver(dev, NULL); 863 dev->state = DS_NOTPRESENT; 864 } 865 } 866 } else { 867 device_print_prettyname(dev); 868 printf("not probed (disabled)\n"); 869 } 870 871 return error; 872 } 873 874 int 875 device_detach(device_t dev) 876 { 877 int error; 878 879 PDEBUG(("%s", DEVICENAME(dev))); 880 if (dev->state == DS_BUSY) 881 return EBUSY; 882 if (dev->state != DS_ATTACHED) 883 return 0; 884 885 if (error = DEVICE_DETACH(dev)) 886 return error; 887 888 if (!(dev->flags & DF_FIXEDCLASS)) 889 devclass_delete_device(dev->devclass, dev); 890 891 dev->state = DS_NOTPRESENT; 892 device_set_driver(dev, NULL); 893 894 return 0; 895 } 896 897 int 898 device_shutdown(device_t dev) 899 { 900 if (dev->state < DS_ATTACHED) 901 return 0; 902 return DEVICE_SHUTDOWN(dev); 903 } 904 905 /* 906 * Access functions for device resources. 907 */ 908 extern struct config_device devtab[]; 909 extern int devtab_count; 910 911 static int 912 resource_match_string(int i, char *resname, char *value) 913 { 914 int j; 915 struct config_resource *res; 916 917 for (j = 0, res = devtab[i].resources; 918 j < devtab[i].resource_count; j++, res++) 919 if (!strcmp(res->name, resname) 920 && res->type == RES_STRING 921 && !strcmp(res->u.stringval, value)) 922 return TRUE; 923 return FALSE; 924 } 925 926 static int 927 resource_find(const char *name, int unit, char *resname, 928 struct config_resource **result) 929 { 930 int i, j; 931 struct config_resource *res; 932 933 /* 934 * First check specific instances, then generic. 935 */ 936 for (i = 0; i < devtab_count; i++) { 937 if (devtab[i].unit < 0) 938 continue; 939 if (!strcmp(devtab[i].name, name) && devtab[i].unit == unit) { 940 res = devtab[i].resources; 941 for (j = 0; j < devtab[i].resource_count; j++, res++) 942 if (!strcmp(res->name, resname)) { 943 *result = res; 944 return 0; 945 } 946 } 947 } 948 for (i = 0; i < devtab_count; i++) { 949 if (devtab[i].unit >= 0) 950 continue; 951 if (!strcmp(devtab[i].name, name) && devtab[i].unit == unit) { 952 res = devtab[i].resources; 953 for (j = 0; j < devtab[i].resource_count; j++, res++) 954 if (!strcmp(res->name, resname)) { 955 *result = res; 956 return 0; 957 } 958 } 959 } 960 return ENOENT; 961 } 962 963 int 964 resource_int_value(const char *name, int unit, char *resname, int *result) 965 { 966 int error; 967 struct config_resource *res; 968 if ((error = resource_find(name, unit, resname, &res)) != 0) 969 return error; 970 if (res->type != RES_INT) 971 return EFTYPE; 972 *result = res->u.intval; 973 return 0; 974 } 975 976 int 977 resource_long_value(const char *name, int unit, char *resname, long *result) 978 { 979 int error; 980 struct config_resource *res; 981 if ((error = resource_find(name, unit, resname, &res)) != 0) 982 return error; 983 if (res->type != RES_LONG) 984 return EFTYPE; 985 *result = res->u.longval; 986 return 0; 987 } 988 989 int 990 resource_string_value(const char *name, int unit, char *resname, char **result) 991 { 992 int error; 993 struct config_resource *res; 994 if ((error = resource_find(name, unit, resname, &res)) != 0) 995 return error; 996 if (res->type != RES_STRING) 997 return EFTYPE; 998 *result = res->u.stringval; 999 return 0; 1000 } 1001 1002 int 1003 resource_query_string(int i, char *resname, char *value) 1004 { 1005 if (i < 0) 1006 i = 0; 1007 else 1008 i = i + 1; 1009 for (; i < devtab_count; i++) 1010 if (resource_match_string(i, resname, value)) 1011 return i; 1012 return -1; 1013 } 1014 1015 char * 1016 resource_query_name(int i) 1017 { 1018 return devtab[i].name; 1019 } 1020 1021 int 1022 resource_query_unit(int i) 1023 { 1024 return devtab[i].unit; 1025 } 1026 1027 1028 /* 1029 * Some useful method implementations to make life easier for bus drivers. 1030 */ 1031 int 1032 bus_generic_attach(device_t dev) 1033 { 1034 device_t child; 1035 1036 for (child = TAILQ_FIRST(&dev->children); 1037 child; child = TAILQ_NEXT(child, link)) 1038 device_probe_and_attach(child); 1039 1040 return 0; 1041 } 1042 1043 int 1044 bus_generic_detach(device_t dev) 1045 { 1046 device_t child; 1047 int error; 1048 1049 if (dev->state != DS_ATTACHED) 1050 return EBUSY; 1051 1052 for (child = TAILQ_FIRST(&dev->children); 1053 child; child = TAILQ_NEXT(child, link)) 1054 if (error = device_detach(child)) 1055 return error; 1056 1057 return 0; 1058 } 1059 1060 int 1061 bus_generic_shutdown(device_t dev) 1062 { 1063 device_t child; 1064 1065 for (child = TAILQ_FIRST(&dev->children); 1066 child; child = TAILQ_NEXT(child, link)) 1067 DEVICE_SHUTDOWN(child); 1068 1069 return 0; 1070 } 1071 1072 int 1073 bus_generic_suspend(device_t dev) 1074 { 1075 int error; 1076 device_t child, child2; 1077 1078 for (child = TAILQ_FIRST(&dev->children); 1079 child; child = TAILQ_NEXT(child, link)) { 1080 error = DEVICE_SUSPEND(child); 1081 if (error) { 1082 for (child2 = TAILQ_FIRST(&dev->children); 1083 child2 && child2 != child; 1084 child2 = TAILQ_NEXT(child2, link)) 1085 DEVICE_RESUME(child2); 1086 return (error); 1087 } 1088 } 1089 return 0; 1090 } 1091 1092 int 1093 bus_generic_resume(device_t dev) 1094 { 1095 device_t child; 1096 1097 for (child = TAILQ_FIRST(&dev->children); 1098 child; child = TAILQ_NEXT(child, link)) { 1099 DEVICE_RESUME(child); 1100 /* if resume fails, there's nothing we can usefully do... */ 1101 } 1102 return 0; 1103 } 1104 1105 void 1106 bus_generic_print_child(device_t dev, device_t child) 1107 { 1108 printf(" on %s%d", device_get_name(dev), device_get_unit(dev)); 1109 } 1110 1111 int 1112 bus_generic_read_ivar(device_t dev, device_t child, int index, 1113 uintptr_t * result) 1114 { 1115 return ENOENT; 1116 } 1117 1118 int 1119 bus_generic_write_ivar(device_t dev, device_t child, int index, 1120 uintptr_t value) 1121 { 1122 return ENOENT; 1123 } 1124 1125 int 1126 bus_generic_setup_intr(device_t dev, device_t child, struct resource *irq, 1127 driver_intr_t *intr, void *arg, void **cookiep) 1128 { 1129 /* Propagate up the bus hierarchy until someone handles it. */ 1130 if (dev->parent) 1131 return (BUS_SETUP_INTR(dev->parent, child, irq, intr, arg, 1132 cookiep)); 1133 else 1134 return (EINVAL); 1135 } 1136 1137 int 1138 bus_generic_teardown_intr(device_t dev, device_t child, struct resource *irq, 1139 void *cookie) 1140 { 1141 /* Propagate up the bus hierarchy until someone handles it. */ 1142 if (dev->parent) 1143 return (BUS_TEARDOWN_INTR(dev->parent, child, irq, cookie)); 1144 else 1145 return (EINVAL); 1146 } 1147 1148 struct resource * 1149 bus_generic_alloc_resource(device_t dev, device_t child, int type, int *rid, 1150 u_long start, u_long end, u_long count, u_int flags) 1151 { 1152 /* Propagate up the bus hierarchy until someone handles it. */ 1153 if (dev->parent) 1154 return (BUS_ALLOC_RESOURCE(dev->parent, child, type, rid, 1155 start, end, count, flags)); 1156 else 1157 return (NULL); 1158 } 1159 1160 int 1161 bus_generic_release_resource(device_t dev, device_t child, int type, int rid, 1162 struct resource *r) 1163 { 1164 /* Propagate up the bus hierarchy until someone handles it. */ 1165 if (dev->parent) 1166 return (BUS_RELEASE_RESOURCE(dev->parent, child, type, rid, 1167 r)); 1168 else 1169 return (EINVAL); 1170 } 1171 1172 int 1173 bus_generic_activate_resource(device_t dev, device_t child, int type, int rid, 1174 struct resource *r) 1175 { 1176 /* Propagate up the bus hierarchy until someone handles it. */ 1177 if (dev->parent) 1178 return (BUS_ACTIVATE_RESOURCE(dev->parent, child, type, rid, 1179 r)); 1180 else 1181 return (EINVAL); 1182 } 1183 1184 int 1185 bus_generic_deactivate_resource(device_t dev, device_t child, int type, 1186 int rid, struct resource *r) 1187 { 1188 /* Propagate up the bus hierarchy until someone handles it. */ 1189 if (dev->parent) 1190 return (BUS_DEACTIVATE_RESOURCE(dev->parent, child, type, rid, 1191 r)); 1192 else 1193 return (EINVAL); 1194 } 1195 1196 /* 1197 * Some convenience functions to make it easier for drivers to use the 1198 * resource-management functions. All these really do is hide the 1199 * indirection through the parent's method table, making for slightly 1200 * less-wordy code. In the future, it might make sense for this code 1201 * to maintain some sort of a list of resources allocated by each device. 1202 */ 1203 struct resource * 1204 bus_alloc_resource(device_t dev, int type, int *rid, u_long start, u_long end, 1205 u_long count, u_int flags) 1206 { 1207 if (dev->parent == 0) 1208 return (0); 1209 return (BUS_ALLOC_RESOURCE(dev->parent, dev, type, rid, start, end, 1210 count, flags)); 1211 } 1212 1213 int 1214 bus_activate_resource(device_t dev, int type, int rid, struct resource *r) 1215 { 1216 if (dev->parent == 0) 1217 return (EINVAL); 1218 return (BUS_ACTIVATE_RESOURCE(dev->parent, dev, type, rid, r)); 1219 } 1220 1221 int 1222 bus_deactivate_resource(device_t dev, int type, int rid, struct resource *r) 1223 { 1224 if (dev->parent == 0) 1225 return (EINVAL); 1226 return (BUS_DEACTIVATE_RESOURCE(dev->parent, dev, type, rid, r)); 1227 } 1228 1229 int 1230 bus_release_resource(device_t dev, int type, int rid, struct resource *r) 1231 { 1232 if (dev->parent == 0) 1233 return (EINVAL); 1234 return (BUS_RELEASE_RESOURCE(dev->parent, dev, 1235 type, rid, r)); 1236 } 1237 1238 static void 1239 root_print_child(device_t dev, device_t child) 1240 { 1241 } 1242 1243 static int 1244 root_setup_intr(device_t dev, device_t child, driver_intr_t *intr, void *arg, 1245 void **cookiep) 1246 { 1247 /* 1248 * If an interrupt mapping gets to here something bad has happened. 1249 */ 1250 panic("root_setup_intr"); 1251 } 1252 1253 static device_method_t root_methods[] = { 1254 /* Device interface */ 1255 DEVMETHOD(device_suspend, bus_generic_suspend), 1256 DEVMETHOD(device_resume, bus_generic_resume), 1257 1258 /* Bus interface */ 1259 DEVMETHOD(bus_print_child, root_print_child), 1260 DEVMETHOD(bus_read_ivar, bus_generic_read_ivar), 1261 DEVMETHOD(bus_write_ivar, bus_generic_write_ivar), 1262 DEVMETHOD(bus_setup_intr, root_setup_intr), 1263 1264 { 0, 0 } 1265 }; 1266 1267 static driver_t root_driver = { 1268 "root", 1269 root_methods, 1270 DRIVER_TYPE_MISC, 1271 1, /* no softc */ 1272 }; 1273 1274 device_t root_bus; 1275 devclass_t root_devclass; 1276 1277 static int 1278 root_bus_module_handler(module_t mod, int what, void* arg) 1279 { 1280 switch (what) { 1281 case MOD_LOAD: 1282 compile_methods(&root_driver); 1283 root_bus = make_device(NULL, "root", 0, NULL); 1284 root_bus->desc = "System root bus"; 1285 root_bus->ops = root_driver.ops; 1286 root_bus->driver = &root_driver; 1287 root_bus->state = DS_ATTACHED; 1288 root_devclass = devclass_find_internal("root", FALSE); 1289 return 0; 1290 } 1291 1292 return 0; 1293 } 1294 1295 static moduledata_t root_bus_mod = { 1296 "rootbus", 1297 root_bus_module_handler, 1298 0 1299 }; 1300 DECLARE_MODULE(rootbus, root_bus_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 1301 1302 void 1303 root_bus_configure(void) 1304 { 1305 device_t dev; 1306 1307 PDEBUG((".")); 1308 1309 for (dev = TAILQ_FIRST(&root_bus->children); dev; 1310 dev = TAILQ_NEXT(dev, link)) { 1311 device_probe_and_attach(dev); 1312 } 1313 } 1314 1315 int 1316 driver_module_handler(module_t mod, int what, void *arg) 1317 { 1318 int error, i; 1319 struct driver_module_data *dmd; 1320 devclass_t bus_devclass; 1321 1322 dmd = (struct driver_module_data *)arg; 1323 bus_devclass = devclass_find_internal(dmd->dmd_busname, TRUE); 1324 error = 0; 1325 1326 switch (what) { 1327 case MOD_LOAD: 1328 for (i = 0; !error && i < dmd->dmd_ndrivers; i++) { 1329 PDEBUG(("Loading module: driver %s on bus %s", 1330 DRIVERNAME(dmd->dmd_drivers[i]), 1331 dmd->dmd_busname)); 1332 error = devclass_add_driver(bus_devclass, 1333 dmd->dmd_drivers[i]); 1334 } 1335 if (error) 1336 break; 1337 1338 /* 1339 * The drivers loaded in this way are assumed to all 1340 * implement the same devclass. 1341 */ 1342 *dmd->dmd_devclass = 1343 devclass_find_internal(dmd->dmd_drivers[0]->name, 1344 TRUE); 1345 break; 1346 1347 case MOD_UNLOAD: 1348 for (i = 0; !error && i < dmd->dmd_ndrivers; i++) { 1349 PDEBUG(("Unloading module: driver %s from bus %s", 1350 DRIVERNAME(dmd->dmd_drivers[i]), 1351 dmd->dmd_busname)); 1352 error = devclass_delete_driver(bus_devclass, 1353 dmd->dmd_drivers[i]); 1354 } 1355 break; 1356 } 1357 1358 if (!error && dmd->dmd_chainevh) 1359 error = dmd->dmd_chainevh(mod, what, dmd->dmd_chainarg); 1360 return (error); 1361 } 1362 1363 #ifdef BUS_DEBUG 1364 1365 /* the _short versions avoid iteration by not calling anything that prints 1366 * more than oneliners. I love oneliners. 1367 */ 1368 1369 static void 1370 print_method_list(device_method_t *m, int indent) 1371 { 1372 int i; 1373 1374 if (!m) 1375 return; 1376 1377 for (i = 0; m->desc; i++, m++) 1378 indentprintf(("method %d: %s, offset=%d\n", 1379 i, m->desc->name, m->desc->offset)); 1380 } 1381 1382 static void 1383 print_device_ops(device_ops_t ops, int indent) 1384 { 1385 int i; 1386 int count = 0; 1387 1388 if (!ops) 1389 return; 1390 1391 /* we present a list of the methods that are pointing to the 1392 * error_method, but ignore the 0'th elements; it is always 1393 * error_method. 1394 */ 1395 for (i = 1; i < ops->maxoffset; i++) { 1396 if (ops->methods[i] == error_method) { 1397 if (count == 0) 1398 indentprintf(("error_method:")); 1399 printf(" %d", i); 1400 count++; 1401 } 1402 } 1403 if (count) 1404 printf("\n"); 1405 1406 indentprintf(("(%d method%s, %d valid, %d error_method%s)\n", 1407 ops->maxoffset-1, (ops->maxoffset-1 == 1? "":"s"), 1408 ops->maxoffset-1-count, 1409 count, (count == 1? "":"'s"))); 1410 } 1411 1412 static void 1413 print_device_short(device_t dev, int indent) 1414 { 1415 if (!dev) 1416 return; 1417 1418 indentprintf(("device %d: <%s> %sparent,%schildren,%s%s%s%sivars,%ssoftc,busy=%d\n", 1419 dev->unit, dev->desc, 1420 (dev->parent? "":"no "), 1421 (TAILQ_EMPTY(&dev->children)? "no ":""), 1422 (dev->flags&DF_ENABLED? "enabled,":"disabled,"), 1423 (dev->flags&DF_FIXEDCLASS? "fixed,":""), 1424 (dev->flags&DF_WILDCARD? "wildcard,":""), 1425 (dev->ivars? "":"no "), 1426 (dev->softc? "":"no "), 1427 dev->busy)); 1428 } 1429 1430 static void 1431 print_device(device_t dev, int indent) 1432 { 1433 if (!dev) 1434 return; 1435 1436 print_device_short(dev, indent); 1437 1438 indentprintf(("Parent:\n")); 1439 print_device_short(dev->parent, indent+1); 1440 indentprintf(("Methods:\n")); 1441 print_device_ops(dev->ops, indent+1); 1442 indentprintf(("Driver:\n")); 1443 print_driver_short(dev->driver, indent+1); 1444 indentprintf(("Devclass:\n")); 1445 print_devclass_short(dev->devclass, indent+1); 1446 } 1447 1448 void 1449 print_device_tree_short(device_t dev, int indent) 1450 /* print the device and all its children (indented) */ 1451 { 1452 device_t child; 1453 1454 if (!dev) 1455 return; 1456 1457 print_device_short(dev, indent); 1458 1459 for (child = TAILQ_FIRST(&dev->children); child; 1460 child = TAILQ_NEXT(child, link)) 1461 print_device_tree_short(child, indent+1); 1462 } 1463 1464 void 1465 print_device_tree(device_t dev, int indent) 1466 /* print the device and all its children (indented) */ 1467 { 1468 device_t child; 1469 1470 if (!dev) 1471 return; 1472 1473 print_device(dev, indent); 1474 1475 for (child = TAILQ_FIRST(&dev->children); child; 1476 child = TAILQ_NEXT(child, link)) 1477 print_device_tree(child, indent+1); 1478 } 1479 1480 static void 1481 print_driver_short(driver_t *driver, int indent) 1482 { 1483 if (!driver) 1484 return; 1485 1486 indentprintf(("driver %s: type = %s%s%s%s, softc size = %d\n", 1487 driver->name, 1488 /* yes, I know this looks silly, but going to bed at 1489 * two o'clock and having to get up at 7:30 again is silly 1490 * as well. As is sticking your head in a bucket of water. 1491 */ 1492 (driver->type == DRIVER_TYPE_TTY? "tty":""), 1493 (driver->type == DRIVER_TYPE_BIO? "bio":""), 1494 (driver->type == DRIVER_TYPE_NET? "net":""), 1495 (driver->type == DRIVER_TYPE_MISC? "misc":""), 1496 driver->softc)); 1497 } 1498 1499 static void 1500 print_driver(driver_t *driver, int indent) 1501 { 1502 if (!driver) 1503 return; 1504 1505 print_driver_short(driver, indent); 1506 indentprintf(("Methods:\n")); 1507 print_method_list(driver->methods, indent+1); 1508 indentprintf(("Operations:\n")); 1509 print_device_ops(driver->ops, indent+1); 1510 } 1511 1512 1513 static void 1514 print_driver_list(driver_list_t drivers, int indent) 1515 { 1516 driver_t *driver; 1517 1518 for (driver = TAILQ_FIRST(&drivers); driver; 1519 driver = TAILQ_NEXT(driver, link)) 1520 print_driver(driver, indent); 1521 } 1522 1523 static void 1524 print_devclass_short(devclass_t dc, int indent) 1525 { 1526 if ( !dc ) 1527 return; 1528 1529 indentprintf(("devclass %s: max units = %d, next unit = %d\n", 1530 dc->name, dc->maxunit, dc->nextunit)); 1531 } 1532 1533 static void 1534 print_devclass(devclass_t dc, int indent) 1535 { 1536 int i; 1537 1538 if ( !dc ) 1539 return; 1540 1541 print_devclass_short(dc, indent); 1542 indentprintf(("Drivers:\n")); 1543 print_driver_list(dc->drivers, indent+1); 1544 1545 indentprintf(("Devices:\n")); 1546 for (i = 0; i < dc->maxunit; i++) 1547 if (dc->devices[i]) 1548 print_device(dc->devices[i], indent+1); 1549 } 1550 1551 void 1552 print_devclass_list_short(void) 1553 { 1554 devclass_t dc; 1555 1556 printf("Short listing of devclasses, drivers & devices:\n"); 1557 for (dc = TAILQ_FIRST(&devclasses); dc; dc = TAILQ_NEXT(dc, link)) 1558 print_devclass_short(dc, 0); 1559 } 1560 1561 void 1562 print_devclass_list(void) 1563 { 1564 devclass_t dc; 1565 1566 printf("Full listing of devclasses, drivers & devices:\n"); 1567 for (dc = TAILQ_FIRST(&devclasses); dc; dc = TAILQ_NEXT(dc, link)) 1568 print_devclass(dc, 0); 1569 } 1570 1571 #endif
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