subr_bus.c revision 179087
1/*- 2 * Copyright (c) 1997,1998,2003 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 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/kern/subr_bus.c 179087 2008-05-18 13:55:51Z rpaulo $"); 29 30#include "opt_bus.h" 31 32#include <sys/param.h> 33#include <sys/conf.h> 34#include <sys/filio.h> 35#include <sys/lock.h> 36#include <sys/kernel.h> 37#include <sys/kobj.h> 38#include <sys/malloc.h> 39#include <sys/module.h> 40#include <sys/mutex.h> 41#include <sys/poll.h> 42#include <sys/proc.h> 43#include <sys/condvar.h> 44#include <sys/queue.h> 45#include <machine/bus.h> 46#include <sys/rman.h> 47#include <sys/selinfo.h> 48#include <sys/signalvar.h> 49#include <sys/sysctl.h> 50#include <sys/systm.h> 51#include <sys/uio.h> 52#include <sys/bus.h> 53#include <sys/interrupt.h> 54 55#include <machine/stdarg.h> 56 57#include <vm/uma.h> 58 59SYSCTL_NODE(_hw, OID_AUTO, bus, CTLFLAG_RW, NULL, NULL); 60SYSCTL_NODE(, OID_AUTO, dev, CTLFLAG_RW, NULL, NULL); 61 62/* 63 * Used to attach drivers to devclasses. 64 */ 65typedef struct driverlink *driverlink_t; 66struct driverlink { 67 kobj_class_t driver; 68 TAILQ_ENTRY(driverlink) link; /* list of drivers in devclass */ 69}; 70 71/* 72 * Forward declarations 73 */ 74typedef TAILQ_HEAD(devclass_list, devclass) devclass_list_t; 75typedef TAILQ_HEAD(driver_list, driverlink) driver_list_t; 76typedef TAILQ_HEAD(device_list, device) device_list_t; 77 78struct devclass { 79 TAILQ_ENTRY(devclass) link; 80 devclass_t parent; /* parent in devclass hierarchy */ 81 driver_list_t drivers; /* bus devclasses store drivers for bus */ 82 char *name; 83 device_t *devices; /* array of devices indexed by unit */ 84 int maxunit; /* size of devices array */ 85 86 struct sysctl_ctx_list sysctl_ctx; 87 struct sysctl_oid *sysctl_tree; 88}; 89 90/** 91 * @brief Implementation of device. 92 */ 93struct device { 94 /* 95 * A device is a kernel object. The first field must be the 96 * current ops table for the object. 97 */ 98 KOBJ_FIELDS; 99 100 /* 101 * Device hierarchy. 102 */ 103 TAILQ_ENTRY(device) link; /**< list of devices in parent */ 104 TAILQ_ENTRY(device) devlink; /**< global device list membership */ 105 device_t parent; /**< parent of this device */ 106 device_list_t children; /**< list of child devices */ 107 108 /* 109 * Details of this device. 110 */ 111 driver_t *driver; /**< current driver */ 112 devclass_t devclass; /**< current device class */ 113 int unit; /**< current unit number */ 114 char* nameunit; /**< name+unit e.g. foodev0 */ 115 char* desc; /**< driver specific description */ 116 int busy; /**< count of calls to device_busy() */ 117 device_state_t state; /**< current device state */ 118 u_int32_t devflags; /**< api level flags for device_get_flags() */ 119 u_short flags; /**< internal device flags */ 120#define DF_ENABLED 1 /* device should be probed/attached */ 121#define DF_FIXEDCLASS 2 /* devclass specified at create time */ 122#define DF_WILDCARD 4 /* unit was originally wildcard */ 123#define DF_DESCMALLOCED 8 /* description was malloced */ 124#define DF_QUIET 16 /* don't print verbose attach message */ 125#define DF_DONENOMATCH 32 /* don't execute DEVICE_NOMATCH again */ 126#define DF_EXTERNALSOFTC 64 /* softc not allocated by us */ 127#define DF_REBID 128 /* Can rebid after attach */ 128 u_char order; /**< order from device_add_child_ordered() */ 129 u_char pad; 130 void *ivars; /**< instance variables */ 131 void *softc; /**< current driver's variables */ 132 133 struct sysctl_ctx_list sysctl_ctx; /**< state for sysctl variables */ 134 struct sysctl_oid *sysctl_tree; /**< state for sysctl variables */ 135}; 136 137static MALLOC_DEFINE(M_BUS, "bus", "Bus data structures"); 138static MALLOC_DEFINE(M_BUS_SC, "bus-sc", "Bus data structures, softc"); 139 140#ifdef BUS_DEBUG 141 142static int bus_debug = 1; 143TUNABLE_INT("bus.debug", &bus_debug); 144SYSCTL_INT(_debug, OID_AUTO, bus_debug, CTLFLAG_RW, &bus_debug, 0, 145 "Debug bus code"); 146 147#define PDEBUG(a) if (bus_debug) {printf("%s:%d: ", __func__, __LINE__), printf a; printf("\n");} 148#define DEVICENAME(d) ((d)? device_get_name(d): "no device") 149#define DRIVERNAME(d) ((d)? d->name : "no driver") 150#define DEVCLANAME(d) ((d)? d->name : "no devclass") 151 152/** 153 * Produce the indenting, indent*2 spaces plus a '.' ahead of that to 154 * prevent syslog from deleting initial spaces 155 */ 156#define indentprintf(p) do { int iJ; printf("."); for (iJ=0; iJ<indent; iJ++) printf(" "); printf p ; } while (0) 157 158static void print_device_short(device_t dev, int indent); 159static void print_device(device_t dev, int indent); 160void print_device_tree_short(device_t dev, int indent); 161void print_device_tree(device_t dev, int indent); 162static void print_driver_short(driver_t *driver, int indent); 163static void print_driver(driver_t *driver, int indent); 164static void print_driver_list(driver_list_t drivers, int indent); 165static void print_devclass_short(devclass_t dc, int indent); 166static void print_devclass(devclass_t dc, int indent); 167void print_devclass_list_short(void); 168void print_devclass_list(void); 169 170#else 171/* Make the compiler ignore the function calls */ 172#define PDEBUG(a) /* nop */ 173#define DEVICENAME(d) /* nop */ 174#define DRIVERNAME(d) /* nop */ 175#define DEVCLANAME(d) /* nop */ 176 177#define print_device_short(d,i) /* nop */ 178#define print_device(d,i) /* nop */ 179#define print_device_tree_short(d,i) /* nop */ 180#define print_device_tree(d,i) /* nop */ 181#define print_driver_short(d,i) /* nop */ 182#define print_driver(d,i) /* nop */ 183#define print_driver_list(d,i) /* nop */ 184#define print_devclass_short(d,i) /* nop */ 185#define print_devclass(d,i) /* nop */ 186#define print_devclass_list_short() /* nop */ 187#define print_devclass_list() /* nop */ 188#endif 189 190/* 191 * dev sysctl tree 192 */ 193 194enum { 195 DEVCLASS_SYSCTL_PARENT, 196}; 197 198static int 199devclass_sysctl_handler(SYSCTL_HANDLER_ARGS) 200{ 201 devclass_t dc = (devclass_t)arg1; 202 const char *value; 203 204 switch (arg2) { 205 case DEVCLASS_SYSCTL_PARENT: 206 value = dc->parent ? dc->parent->name : ""; 207 break; 208 default: 209 return (EINVAL); 210 } 211 return (SYSCTL_OUT(req, value, strlen(value))); 212} 213 214static void 215devclass_sysctl_init(devclass_t dc) 216{ 217 218 if (dc->sysctl_tree != NULL) 219 return; 220 sysctl_ctx_init(&dc->sysctl_ctx); 221 dc->sysctl_tree = SYSCTL_ADD_NODE(&dc->sysctl_ctx, 222 SYSCTL_STATIC_CHILDREN(_dev), OID_AUTO, dc->name, 223 CTLFLAG_RD, 0, ""); 224 SYSCTL_ADD_PROC(&dc->sysctl_ctx, SYSCTL_CHILDREN(dc->sysctl_tree), 225 OID_AUTO, "%parent", CTLFLAG_RD, 226 dc, DEVCLASS_SYSCTL_PARENT, devclass_sysctl_handler, "A", 227 "parent class"); 228} 229 230enum { 231 DEVICE_SYSCTL_DESC, 232 DEVICE_SYSCTL_DRIVER, 233 DEVICE_SYSCTL_LOCATION, 234 DEVICE_SYSCTL_PNPINFO, 235 DEVICE_SYSCTL_PARENT, 236}; 237 238static int 239device_sysctl_handler(SYSCTL_HANDLER_ARGS) 240{ 241 device_t dev = (device_t)arg1; 242 const char *value; 243 char *buf; 244 int error; 245 246 buf = NULL; 247 switch (arg2) { 248 case DEVICE_SYSCTL_DESC: 249 value = dev->desc ? dev->desc : ""; 250 break; 251 case DEVICE_SYSCTL_DRIVER: 252 value = dev->driver ? dev->driver->name : ""; 253 break; 254 case DEVICE_SYSCTL_LOCATION: 255 value = buf = malloc(1024, M_BUS, M_WAITOK | M_ZERO); 256 bus_child_location_str(dev, buf, 1024); 257 break; 258 case DEVICE_SYSCTL_PNPINFO: 259 value = buf = malloc(1024, M_BUS, M_WAITOK | M_ZERO); 260 bus_child_pnpinfo_str(dev, buf, 1024); 261 break; 262 case DEVICE_SYSCTL_PARENT: 263 value = dev->parent ? dev->parent->nameunit : ""; 264 break; 265 default: 266 return (EINVAL); 267 } 268 error = SYSCTL_OUT(req, value, strlen(value)); 269 if (buf != NULL) 270 free(buf, M_BUS); 271 return (error); 272} 273 274static void 275device_sysctl_init(device_t dev) 276{ 277 devclass_t dc = dev->devclass; 278 279 if (dev->sysctl_tree != NULL) 280 return; 281 devclass_sysctl_init(dc); 282 sysctl_ctx_init(&dev->sysctl_ctx); 283 dev->sysctl_tree = SYSCTL_ADD_NODE(&dev->sysctl_ctx, 284 SYSCTL_CHILDREN(dc->sysctl_tree), OID_AUTO, 285 dev->nameunit + strlen(dc->name), 286 CTLFLAG_RD, 0, ""); 287 SYSCTL_ADD_PROC(&dev->sysctl_ctx, SYSCTL_CHILDREN(dev->sysctl_tree), 288 OID_AUTO, "%desc", CTLFLAG_RD, 289 dev, DEVICE_SYSCTL_DESC, device_sysctl_handler, "A", 290 "device description"); 291 SYSCTL_ADD_PROC(&dev->sysctl_ctx, SYSCTL_CHILDREN(dev->sysctl_tree), 292 OID_AUTO, "%driver", CTLFLAG_RD, 293 dev, DEVICE_SYSCTL_DRIVER, device_sysctl_handler, "A", 294 "device driver name"); 295 SYSCTL_ADD_PROC(&dev->sysctl_ctx, SYSCTL_CHILDREN(dev->sysctl_tree), 296 OID_AUTO, "%location", CTLFLAG_RD, 297 dev, DEVICE_SYSCTL_LOCATION, device_sysctl_handler, "A", 298 "device location relative to parent"); 299 SYSCTL_ADD_PROC(&dev->sysctl_ctx, SYSCTL_CHILDREN(dev->sysctl_tree), 300 OID_AUTO, "%pnpinfo", CTLFLAG_RD, 301 dev, DEVICE_SYSCTL_PNPINFO, device_sysctl_handler, "A", 302 "device identification"); 303 SYSCTL_ADD_PROC(&dev->sysctl_ctx, SYSCTL_CHILDREN(dev->sysctl_tree), 304 OID_AUTO, "%parent", CTLFLAG_RD, 305 dev, DEVICE_SYSCTL_PARENT, device_sysctl_handler, "A", 306 "parent device"); 307} 308 309static void 310device_sysctl_update(device_t dev) 311{ 312 devclass_t dc = dev->devclass; 313 314 if (dev->sysctl_tree == NULL) 315 return; 316 sysctl_rename_oid(dev->sysctl_tree, dev->nameunit + strlen(dc->name)); 317} 318 319static void 320device_sysctl_fini(device_t dev) 321{ 322 if (dev->sysctl_tree == NULL) 323 return; 324 sysctl_ctx_free(&dev->sysctl_ctx); 325 dev->sysctl_tree = NULL; 326} 327 328/* 329 * /dev/devctl implementation 330 */ 331 332/* 333 * This design allows only one reader for /dev/devctl. This is not desirable 334 * in the long run, but will get a lot of hair out of this implementation. 335 * Maybe we should make this device a clonable device. 336 * 337 * Also note: we specifically do not attach a device to the device_t tree 338 * to avoid potential chicken and egg problems. One could argue that all 339 * of this belongs to the root node. One could also further argue that the 340 * sysctl interface that we have not might more properly be an ioctl 341 * interface, but at this stage of the game, I'm not inclined to rock that 342 * boat. 343 * 344 * I'm also not sure that the SIGIO support is done correctly or not, as 345 * I copied it from a driver that had SIGIO support that likely hasn't been 346 * tested since 3.4 or 2.2.8! 347 */ 348 349static int sysctl_devctl_disable(SYSCTL_HANDLER_ARGS); 350static int devctl_disable = 0; 351TUNABLE_INT("hw.bus.devctl_disable", &devctl_disable); 352SYSCTL_PROC(_hw_bus, OID_AUTO, devctl_disable, CTLTYPE_INT | CTLFLAG_RW, 0, 0, 353 sysctl_devctl_disable, "I", "devctl disable"); 354 355static d_open_t devopen; 356static d_close_t devclose; 357static d_read_t devread; 358static d_ioctl_t devioctl; 359static d_poll_t devpoll; 360 361static struct cdevsw dev_cdevsw = { 362 .d_version = D_VERSION, 363 .d_flags = D_NEEDGIANT, 364 .d_open = devopen, 365 .d_close = devclose, 366 .d_read = devread, 367 .d_ioctl = devioctl, 368 .d_poll = devpoll, 369 .d_name = "devctl", 370}; 371 372struct dev_event_info 373{ 374 char *dei_data; 375 TAILQ_ENTRY(dev_event_info) dei_link; 376}; 377 378TAILQ_HEAD(devq, dev_event_info); 379 380static struct dev_softc 381{ 382 int inuse; 383 int nonblock; 384 struct mtx mtx; 385 struct cv cv; 386 struct selinfo sel; 387 struct devq devq; 388 struct proc *async_proc; 389} devsoftc; 390 391static struct cdev *devctl_dev; 392 393static void 394devinit(void) 395{ 396 devctl_dev = make_dev(&dev_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, 397 "devctl"); 398 mtx_init(&devsoftc.mtx, "dev mtx", "devd", MTX_DEF); 399 cv_init(&devsoftc.cv, "dev cv"); 400 TAILQ_INIT(&devsoftc.devq); 401} 402 403static int 404devopen(struct cdev *dev, int oflags, int devtype, d_thread_t *td) 405{ 406 if (devsoftc.inuse) 407 return (EBUSY); 408 /* move to init */ 409 devsoftc.inuse = 1; 410 devsoftc.nonblock = 0; 411 devsoftc.async_proc = NULL; 412 return (0); 413} 414 415static int 416devclose(struct cdev *dev, int fflag, int devtype, d_thread_t *td) 417{ 418 devsoftc.inuse = 0; 419 mtx_lock(&devsoftc.mtx); 420 cv_broadcast(&devsoftc.cv); 421 mtx_unlock(&devsoftc.mtx); 422 423 return (0); 424} 425 426/* 427 * The read channel for this device is used to report changes to 428 * userland in realtime. We are required to free the data as well as 429 * the n1 object because we allocate them separately. Also note that 430 * we return one record at a time. If you try to read this device a 431 * character at a time, you will lose the rest of the data. Listening 432 * programs are expected to cope. 433 */ 434static int 435devread(struct cdev *dev, struct uio *uio, int ioflag) 436{ 437 struct dev_event_info *n1; 438 int rv; 439 440 mtx_lock(&devsoftc.mtx); 441 while (TAILQ_EMPTY(&devsoftc.devq)) { 442 if (devsoftc.nonblock) { 443 mtx_unlock(&devsoftc.mtx); 444 return (EAGAIN); 445 } 446 rv = cv_wait_sig(&devsoftc.cv, &devsoftc.mtx); 447 if (rv) { 448 /* 449 * Need to translate ERESTART to EINTR here? -- jake 450 */ 451 mtx_unlock(&devsoftc.mtx); 452 return (rv); 453 } 454 } 455 n1 = TAILQ_FIRST(&devsoftc.devq); 456 TAILQ_REMOVE(&devsoftc.devq, n1, dei_link); 457 mtx_unlock(&devsoftc.mtx); 458 rv = uiomove(n1->dei_data, strlen(n1->dei_data), uio); 459 free(n1->dei_data, M_BUS); 460 free(n1, M_BUS); 461 return (rv); 462} 463 464static int 465devioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, d_thread_t *td) 466{ 467 switch (cmd) { 468 469 case FIONBIO: 470 if (*(int*)data) 471 devsoftc.nonblock = 1; 472 else 473 devsoftc.nonblock = 0; 474 return (0); 475 case FIOASYNC: 476 if (*(int*)data) 477 devsoftc.async_proc = td->td_proc; 478 else 479 devsoftc.async_proc = NULL; 480 return (0); 481 482 /* (un)Support for other fcntl() calls. */ 483 case FIOCLEX: 484 case FIONCLEX: 485 case FIONREAD: 486 case FIOSETOWN: 487 case FIOGETOWN: 488 default: 489 break; 490 } 491 return (ENOTTY); 492} 493 494static int 495devpoll(struct cdev *dev, int events, d_thread_t *td) 496{ 497 int revents = 0; 498 499 mtx_lock(&devsoftc.mtx); 500 if (events & (POLLIN | POLLRDNORM)) { 501 if (!TAILQ_EMPTY(&devsoftc.devq)) 502 revents = events & (POLLIN | POLLRDNORM); 503 else 504 selrecord(td, &devsoftc.sel); 505 } 506 mtx_unlock(&devsoftc.mtx); 507 508 return (revents); 509} 510 511/** 512 * @brief Return whether the userland process is running 513 */ 514boolean_t 515devctl_process_running(void) 516{ 517 return (devsoftc.inuse == 1); 518} 519 520/** 521 * @brief Queue data to be read from the devctl device 522 * 523 * Generic interface to queue data to the devctl device. It is 524 * assumed that @p data is properly formatted. It is further assumed 525 * that @p data is allocated using the M_BUS malloc type. 526 */ 527void 528devctl_queue_data(char *data) 529{ 530 struct dev_event_info *n1 = NULL; 531 struct proc *p; 532 533 n1 = malloc(sizeof(*n1), M_BUS, M_NOWAIT); 534 if (n1 == NULL) 535 return; 536 n1->dei_data = data; 537 mtx_lock(&devsoftc.mtx); 538 TAILQ_INSERT_TAIL(&devsoftc.devq, n1, dei_link); 539 cv_broadcast(&devsoftc.cv); 540 mtx_unlock(&devsoftc.mtx); 541 selwakeup(&devsoftc.sel); 542 p = devsoftc.async_proc; 543 if (p != NULL) { 544 PROC_LOCK(p); 545 psignal(p, SIGIO); 546 PROC_UNLOCK(p); 547 } 548} 549 550/** 551 * @brief Send a 'notification' to userland, using standard ways 552 */ 553void 554devctl_notify(const char *system, const char *subsystem, const char *type, 555 const char *data) 556{ 557 int len = 0; 558 char *msg; 559 560 if (system == NULL) 561 return; /* BOGUS! Must specify system. */ 562 if (subsystem == NULL) 563 return; /* BOGUS! Must specify subsystem. */ 564 if (type == NULL) 565 return; /* BOGUS! Must specify type. */ 566 len += strlen(" system=") + strlen(system); 567 len += strlen(" subsystem=") + strlen(subsystem); 568 len += strlen(" type=") + strlen(type); 569 /* add in the data message plus newline. */ 570 if (data != NULL) 571 len += strlen(data); 572 len += 3; /* '!', '\n', and NUL */ 573 msg = malloc(len, M_BUS, M_NOWAIT); 574 if (msg == NULL) 575 return; /* Drop it on the floor */ 576 if (data != NULL) 577 snprintf(msg, len, "!system=%s subsystem=%s type=%s %s\n", 578 system, subsystem, type, data); 579 else 580 snprintf(msg, len, "!system=%s subsystem=%s type=%s\n", 581 system, subsystem, type); 582 devctl_queue_data(msg); 583} 584 585/* 586 * Common routine that tries to make sending messages as easy as possible. 587 * We allocate memory for the data, copy strings into that, but do not 588 * free it unless there's an error. The dequeue part of the driver should 589 * free the data. We don't send data when the device is disabled. We do 590 * send data, even when we have no listeners, because we wish to avoid 591 * races relating to startup and restart of listening applications. 592 * 593 * devaddq is designed to string together the type of event, with the 594 * object of that event, plus the plug and play info and location info 595 * for that event. This is likely most useful for devices, but less 596 * useful for other consumers of this interface. Those should use 597 * the devctl_queue_data() interface instead. 598 */ 599static void 600devaddq(const char *type, const char *what, device_t dev) 601{ 602 char *data = NULL; 603 char *loc = NULL; 604 char *pnp = NULL; 605 const char *parstr; 606 607 if (devctl_disable) 608 return; 609 data = malloc(1024, M_BUS, M_NOWAIT); 610 if (data == NULL) 611 goto bad; 612 613 /* get the bus specific location of this device */ 614 loc = malloc(1024, M_BUS, M_NOWAIT); 615 if (loc == NULL) 616 goto bad; 617 *loc = '\0'; 618 bus_child_location_str(dev, loc, 1024); 619 620 /* Get the bus specific pnp info of this device */ 621 pnp = malloc(1024, M_BUS, M_NOWAIT); 622 if (pnp == NULL) 623 goto bad; 624 *pnp = '\0'; 625 bus_child_pnpinfo_str(dev, pnp, 1024); 626 627 /* Get the parent of this device, or / if high enough in the tree. */ 628 if (device_get_parent(dev) == NULL) 629 parstr = "."; /* Or '/' ? */ 630 else 631 parstr = device_get_nameunit(device_get_parent(dev)); 632 /* String it all together. */ 633 snprintf(data, 1024, "%s%s at %s %s on %s\n", type, what, loc, pnp, 634 parstr); 635 free(loc, M_BUS); 636 free(pnp, M_BUS); 637 devctl_queue_data(data); 638 return; 639bad: 640 free(pnp, M_BUS); 641 free(loc, M_BUS); 642 free(data, M_BUS); 643 return; 644} 645 646/* 647 * A device was added to the tree. We are called just after it successfully 648 * attaches (that is, probe and attach success for this device). No call 649 * is made if a device is merely parented into the tree. See devnomatch 650 * if probe fails. If attach fails, no notification is sent (but maybe 651 * we should have a different message for this). 652 */ 653static void 654devadded(device_t dev) 655{ 656 char *pnp = NULL; 657 char *tmp = NULL; 658 659 pnp = malloc(1024, M_BUS, M_NOWAIT); 660 if (pnp == NULL) 661 goto fail; 662 tmp = malloc(1024, M_BUS, M_NOWAIT); 663 if (tmp == NULL) 664 goto fail; 665 *pnp = '\0'; 666 bus_child_pnpinfo_str(dev, pnp, 1024); 667 snprintf(tmp, 1024, "%s %s", device_get_nameunit(dev), pnp); 668 devaddq("+", tmp, dev); 669fail: 670 if (pnp != NULL) 671 free(pnp, M_BUS); 672 if (tmp != NULL) 673 free(tmp, M_BUS); 674 return; 675} 676 677/* 678 * A device was removed from the tree. We are called just before this 679 * happens. 680 */ 681static void 682devremoved(device_t dev) 683{ 684 char *pnp = NULL; 685 char *tmp = NULL; 686 687 pnp = malloc(1024, M_BUS, M_NOWAIT); 688 if (pnp == NULL) 689 goto fail; 690 tmp = malloc(1024, M_BUS, M_NOWAIT); 691 if (tmp == NULL) 692 goto fail; 693 *pnp = '\0'; 694 bus_child_pnpinfo_str(dev, pnp, 1024); 695 snprintf(tmp, 1024, "%s %s", device_get_nameunit(dev), pnp); 696 devaddq("-", tmp, dev); 697fail: 698 if (pnp != NULL) 699 free(pnp, M_BUS); 700 if (tmp != NULL) 701 free(tmp, M_BUS); 702 return; 703} 704 705/* 706 * Called when there's no match for this device. This is only called 707 * the first time that no match happens, so we don't keep getitng this 708 * message. Should that prove to be undesirable, we can change it. 709 * This is called when all drivers that can attach to a given bus 710 * decline to accept this device. Other errrors may not be detected. 711 */ 712static void 713devnomatch(device_t dev) 714{ 715 devaddq("?", "", dev); 716} 717 718static int 719sysctl_devctl_disable(SYSCTL_HANDLER_ARGS) 720{ 721 struct dev_event_info *n1; 722 int dis, error; 723 724 dis = devctl_disable; 725 error = sysctl_handle_int(oidp, &dis, 0, req); 726 if (error || !req->newptr) 727 return (error); 728 mtx_lock(&devsoftc.mtx); 729 devctl_disable = dis; 730 if (dis) { 731 while (!TAILQ_EMPTY(&devsoftc.devq)) { 732 n1 = TAILQ_FIRST(&devsoftc.devq); 733 TAILQ_REMOVE(&devsoftc.devq, n1, dei_link); 734 free(n1->dei_data, M_BUS); 735 free(n1, M_BUS); 736 } 737 } 738 mtx_unlock(&devsoftc.mtx); 739 return (0); 740} 741 742/* End of /dev/devctl code */ 743 744TAILQ_HEAD(,device) bus_data_devices; 745static int bus_data_generation = 1; 746 747kobj_method_t null_methods[] = { 748 { 0, 0 } 749}; 750 751DEFINE_CLASS(null, null_methods, 0); 752 753/* 754 * Devclass implementation 755 */ 756 757static devclass_list_t devclasses = TAILQ_HEAD_INITIALIZER(devclasses); 758 759 760/** 761 * @internal 762 * @brief Find or create a device class 763 * 764 * If a device class with the name @p classname exists, return it, 765 * otherwise if @p create is non-zero create and return a new device 766 * class. 767 * 768 * If @p parentname is non-NULL, the parent of the devclass is set to 769 * the devclass of that name. 770 * 771 * @param classname the devclass name to find or create 772 * @param parentname the parent devclass name or @c NULL 773 * @param create non-zero to create a devclass 774 */ 775static devclass_t 776devclass_find_internal(const char *classname, const char *parentname, 777 int create) 778{ 779 devclass_t dc; 780 781 PDEBUG(("looking for %s", classname)); 782 if (!classname) 783 return (NULL); 784 785 TAILQ_FOREACH(dc, &devclasses, link) { 786 if (!strcmp(dc->name, classname)) 787 break; 788 } 789 790 if (create && !dc) { 791 PDEBUG(("creating %s", classname)); 792 dc = malloc(sizeof(struct devclass) + strlen(classname) + 1, 793 M_BUS, M_NOWAIT|M_ZERO); 794 if (!dc) 795 return (NULL); 796 dc->parent = NULL; 797 dc->name = (char*) (dc + 1); 798 strcpy(dc->name, classname); 799 TAILQ_INIT(&dc->drivers); 800 TAILQ_INSERT_TAIL(&devclasses, dc, link); 801 802 bus_data_generation_update(); 803 } 804 805 /* 806 * If a parent class is specified, then set that as our parent so 807 * that this devclass will support drivers for the parent class as 808 * well. If the parent class has the same name don't do this though 809 * as it creates a cycle that can trigger an infinite loop in 810 * device_probe_child() if a device exists for which there is no 811 * suitable driver. 812 */ 813 if (parentname && dc && !dc->parent && 814 strcmp(classname, parentname) != 0) { 815 dc->parent = devclass_find_internal(parentname, NULL, FALSE); 816 } 817 818 return (dc); 819} 820 821/** 822 * @brief Create a device class 823 * 824 * If a device class with the name @p classname exists, return it, 825 * otherwise create and return a new device class. 826 * 827 * @param classname the devclass name to find or create 828 */ 829devclass_t 830devclass_create(const char *classname) 831{ 832 return (devclass_find_internal(classname, NULL, TRUE)); 833} 834 835/** 836 * @brief Find a device class 837 * 838 * If a device class with the name @p classname exists, return it, 839 * otherwise return @c NULL. 840 * 841 * @param classname the devclass name to find 842 */ 843devclass_t 844devclass_find(const char *classname) 845{ 846 return (devclass_find_internal(classname, NULL, FALSE)); 847} 848 849/** 850 * @brief Add a device driver to a device class 851 * 852 * Add a device driver to a devclass. This is normally called 853 * automatically by DRIVER_MODULE(). The BUS_DRIVER_ADDED() method of 854 * all devices in the devclass will be called to allow them to attempt 855 * to re-probe any unmatched children. 856 * 857 * @param dc the devclass to edit 858 * @param driver the driver to register 859 */ 860int 861devclass_add_driver(devclass_t dc, driver_t *driver) 862{ 863 driverlink_t dl; 864 int i; 865 866 PDEBUG(("%s", DRIVERNAME(driver))); 867 868 dl = malloc(sizeof *dl, M_BUS, M_NOWAIT|M_ZERO); 869 if (!dl) 870 return (ENOMEM); 871 872 /* 873 * Compile the driver's methods. Also increase the reference count 874 * so that the class doesn't get freed when the last instance 875 * goes. This means we can safely use static methods and avoids a 876 * double-free in devclass_delete_driver. 877 */ 878 kobj_class_compile((kobj_class_t) driver); 879 880 /* 881 * Make sure the devclass which the driver is implementing exists. 882 */ 883 devclass_find_internal(driver->name, NULL, TRUE); 884 885 dl->driver = driver; 886 TAILQ_INSERT_TAIL(&dc->drivers, dl, link); 887 driver->refs++; /* XXX: kobj_mtx */ 888 889 /* 890 * Call BUS_DRIVER_ADDED for any existing busses in this class. 891 */ 892 for (i = 0; i < dc->maxunit; i++) 893 if (dc->devices[i]) 894 BUS_DRIVER_ADDED(dc->devices[i], driver); 895 896 bus_data_generation_update(); 897 return (0); 898} 899 900/** 901 * @brief Delete a device driver from a device class 902 * 903 * Delete a device driver from a devclass. This is normally called 904 * automatically by DRIVER_MODULE(). 905 * 906 * If the driver is currently attached to any devices, 907 * devclass_delete_driver() will first attempt to detach from each 908 * device. If one of the detach calls fails, the driver will not be 909 * deleted. 910 * 911 * @param dc the devclass to edit 912 * @param driver the driver to unregister 913 */ 914int 915devclass_delete_driver(devclass_t busclass, driver_t *driver) 916{ 917 devclass_t dc = devclass_find(driver->name); 918 driverlink_t dl; 919 device_t dev; 920 int i; 921 int error; 922 923 PDEBUG(("%s from devclass %s", driver->name, DEVCLANAME(busclass))); 924 925 if (!dc) 926 return (0); 927 928 /* 929 * Find the link structure in the bus' list of drivers. 930 */ 931 TAILQ_FOREACH(dl, &busclass->drivers, link) { 932 if (dl->driver == driver) 933 break; 934 } 935 936 if (!dl) { 937 PDEBUG(("%s not found in %s list", driver->name, 938 busclass->name)); 939 return (ENOENT); 940 } 941 942 /* 943 * Disassociate from any devices. We iterate through all the 944 * devices in the devclass of the driver and detach any which are 945 * using the driver and which have a parent in the devclass which 946 * we are deleting from. 947 * 948 * Note that since a driver can be in multiple devclasses, we 949 * should not detach devices which are not children of devices in 950 * the affected devclass. 951 */ 952 for (i = 0; i < dc->maxunit; i++) { 953 if (dc->devices[i]) { 954 dev = dc->devices[i]; 955 if (dev->driver == driver && dev->parent && 956 dev->parent->devclass == busclass) { 957 if ((error = device_detach(dev)) != 0) 958 return (error); 959 device_set_driver(dev, NULL); 960 } 961 } 962 } 963 964 TAILQ_REMOVE(&busclass->drivers, dl, link); 965 free(dl, M_BUS); 966 967 /* XXX: kobj_mtx */ 968 driver->refs--; 969 if (driver->refs == 0) 970 kobj_class_free((kobj_class_t) driver); 971 972 bus_data_generation_update(); 973 return (0); 974} 975 976/** 977 * @brief Quiesces a set of device drivers from a device class 978 * 979 * Quiesce a device driver from a devclass. This is normally called 980 * automatically by DRIVER_MODULE(). 981 * 982 * If the driver is currently attached to any devices, 983 * devclass_quiesece_driver() will first attempt to quiesce each 984 * device. 985 * 986 * @param dc the devclass to edit 987 * @param driver the driver to unregister 988 */ 989int 990devclass_quiesce_driver(devclass_t busclass, driver_t *driver) 991{ 992 devclass_t dc = devclass_find(driver->name); 993 driverlink_t dl; 994 device_t dev; 995 int i; 996 int error; 997 998 PDEBUG(("%s from devclass %s", driver->name, DEVCLANAME(busclass))); 999 1000 if (!dc) 1001 return (0); 1002 1003 /* 1004 * Find the link structure in the bus' list of drivers. 1005 */ 1006 TAILQ_FOREACH(dl, &busclass->drivers, link) { 1007 if (dl->driver == driver) 1008 break; 1009 } 1010 1011 if (!dl) { 1012 PDEBUG(("%s not found in %s list", driver->name, 1013 busclass->name)); 1014 return (ENOENT); 1015 } 1016 1017 /* 1018 * Quiesce all devices. We iterate through all the devices in 1019 * the devclass of the driver and quiesce any which are using 1020 * the driver and which have a parent in the devclass which we 1021 * are quiescing. 1022 * 1023 * Note that since a driver can be in multiple devclasses, we 1024 * should not quiesce devices which are not children of 1025 * devices in the affected devclass. 1026 */ 1027 for (i = 0; i < dc->maxunit; i++) { 1028 if (dc->devices[i]) { 1029 dev = dc->devices[i]; 1030 if (dev->driver == driver && dev->parent && 1031 dev->parent->devclass == busclass) { 1032 if ((error = device_quiesce(dev)) != 0) 1033 return (error); 1034 } 1035 } 1036 } 1037 1038 return (0); 1039} 1040 1041/** 1042 * @internal 1043 */ 1044static driverlink_t 1045devclass_find_driver_internal(devclass_t dc, const char *classname) 1046{ 1047 driverlink_t dl; 1048 1049 PDEBUG(("%s in devclass %s", classname, DEVCLANAME(dc))); 1050 1051 TAILQ_FOREACH(dl, &dc->drivers, link) { 1052 if (!strcmp(dl->driver->name, classname)) 1053 return (dl); 1054 } 1055 1056 PDEBUG(("not found")); 1057 return (NULL); 1058} 1059 1060/** 1061 * @brief Search a devclass for a driver 1062 * 1063 * This function searches the devclass's list of drivers and returns 1064 * the first driver whose name is @p classname or @c NULL if there is 1065 * no driver of that name. 1066 * 1067 * @param dc the devclass to search 1068 * @param classname the driver name to search for 1069 */ 1070kobj_class_t 1071devclass_find_driver(devclass_t dc, const char *classname) 1072{ 1073 driverlink_t dl; 1074 1075 dl = devclass_find_driver_internal(dc, classname); 1076 if (dl) 1077 return (dl->driver); 1078 return (NULL); 1079} 1080 1081/** 1082 * @brief Return the name of the devclass 1083 */ 1084const char * 1085devclass_get_name(devclass_t dc) 1086{ 1087 return (dc->name); 1088} 1089 1090/** 1091 * @brief Find a device given a unit number 1092 * 1093 * @param dc the devclass to search 1094 * @param unit the unit number to search for 1095 * 1096 * @returns the device with the given unit number or @c 1097 * NULL if there is no such device 1098 */ 1099device_t 1100devclass_get_device(devclass_t dc, int unit) 1101{ 1102 if (dc == NULL || unit < 0 || unit >= dc->maxunit) 1103 return (NULL); 1104 return (dc->devices[unit]); 1105} 1106 1107/** 1108 * @brief Find the softc field of a device given a unit number 1109 * 1110 * @param dc the devclass to search 1111 * @param unit the unit number to search for 1112 * 1113 * @returns the softc field of the device with the given 1114 * unit number or @c NULL if there is no such 1115 * device 1116 */ 1117void * 1118devclass_get_softc(devclass_t dc, int unit) 1119{ 1120 device_t dev; 1121 1122 dev = devclass_get_device(dc, unit); 1123 if (!dev) 1124 return (NULL); 1125 1126 return (device_get_softc(dev)); 1127} 1128 1129/** 1130 * @brief Get a list of devices in the devclass 1131 * 1132 * An array containing a list of all the devices in the given devclass 1133 * is allocated and returned in @p *devlistp. The number of devices 1134 * in the array is returned in @p *devcountp. The caller should free 1135 * the array using @c free(p, M_TEMP), even if @p *devcountp is 0. 1136 * 1137 * @param dc the devclass to examine 1138 * @param devlistp points at location for array pointer return 1139 * value 1140 * @param devcountp points at location for array size return value 1141 * 1142 * @retval 0 success 1143 * @retval ENOMEM the array allocation failed 1144 */ 1145int 1146devclass_get_devices(devclass_t dc, device_t **devlistp, int *devcountp) 1147{ 1148 int count, i; 1149 device_t *list; 1150 1151 count = devclass_get_count(dc); 1152 list = malloc(count * sizeof(device_t), M_TEMP, M_NOWAIT|M_ZERO); 1153 if (!list) 1154 return (ENOMEM); 1155 1156 count = 0; 1157 for (i = 0; i < dc->maxunit; i++) { 1158 if (dc->devices[i]) { 1159 list[count] = dc->devices[i]; 1160 count++; 1161 } 1162 } 1163 1164 *devlistp = list; 1165 *devcountp = count; 1166 1167 return (0); 1168} 1169 1170/** 1171 * @brief Get a list of drivers in the devclass 1172 * 1173 * An array containing a list of pointers to all the drivers in the 1174 * given devclass is allocated and returned in @p *listp. The number 1175 * of drivers in the array is returned in @p *countp. The caller should 1176 * free the array using @c free(p, M_TEMP). 1177 * 1178 * @param dc the devclass to examine 1179 * @param listp gives location for array pointer return value 1180 * @param countp gives location for number of array elements 1181 * return value 1182 * 1183 * @retval 0 success 1184 * @retval ENOMEM the array allocation failed 1185 */ 1186int 1187devclass_get_drivers(devclass_t dc, driver_t ***listp, int *countp) 1188{ 1189 driverlink_t dl; 1190 driver_t **list; 1191 int count; 1192 1193 count = 0; 1194 TAILQ_FOREACH(dl, &dc->drivers, link) 1195 count++; 1196 list = malloc(count * sizeof(driver_t *), M_TEMP, M_NOWAIT); 1197 if (list == NULL) 1198 return (ENOMEM); 1199 1200 count = 0; 1201 TAILQ_FOREACH(dl, &dc->drivers, link) { 1202 list[count] = dl->driver; 1203 count++; 1204 } 1205 *listp = list; 1206 *countp = count; 1207 1208 return (0); 1209} 1210 1211/** 1212 * @brief Get the number of devices in a devclass 1213 * 1214 * @param dc the devclass to examine 1215 */ 1216int 1217devclass_get_count(devclass_t dc) 1218{ 1219 int count, i; 1220 1221 count = 0; 1222 for (i = 0; i < dc->maxunit; i++) 1223 if (dc->devices[i]) 1224 count++; 1225 return (count); 1226} 1227 1228/** 1229 * @brief Get the maximum unit number used in a devclass 1230 * 1231 * Note that this is one greater than the highest currently-allocated 1232 * unit. If a null devclass_t is passed in, -1 is returned to indicate 1233 * that not even the devclass has been allocated yet. 1234 * 1235 * @param dc the devclass to examine 1236 */ 1237int 1238devclass_get_maxunit(devclass_t dc) 1239{ 1240 if (dc == NULL) 1241 return (-1); 1242 return (dc->maxunit); 1243} 1244 1245/** 1246 * @brief Find a free unit number in a devclass 1247 * 1248 * This function searches for the first unused unit number greater 1249 * that or equal to @p unit. 1250 * 1251 * @param dc the devclass to examine 1252 * @param unit the first unit number to check 1253 */ 1254int 1255devclass_find_free_unit(devclass_t dc, int unit) 1256{ 1257 if (dc == NULL) 1258 return (unit); 1259 while (unit < dc->maxunit && dc->devices[unit] != NULL) 1260 unit++; 1261 return (unit); 1262} 1263 1264/** 1265 * @brief Set the parent of a devclass 1266 * 1267 * The parent class is normally initialised automatically by 1268 * DRIVER_MODULE(). 1269 * 1270 * @param dc the devclass to edit 1271 * @param pdc the new parent devclass 1272 */ 1273void 1274devclass_set_parent(devclass_t dc, devclass_t pdc) 1275{ 1276 dc->parent = pdc; 1277} 1278 1279/** 1280 * @brief Get the parent of a devclass 1281 * 1282 * @param dc the devclass to examine 1283 */ 1284devclass_t 1285devclass_get_parent(devclass_t dc) 1286{ 1287 return (dc->parent); 1288} 1289 1290struct sysctl_ctx_list * 1291devclass_get_sysctl_ctx(devclass_t dc) 1292{ 1293 return (&dc->sysctl_ctx); 1294} 1295 1296struct sysctl_oid * 1297devclass_get_sysctl_tree(devclass_t dc) 1298{ 1299 return (dc->sysctl_tree); 1300} 1301 1302/** 1303 * @internal 1304 * @brief Allocate a unit number 1305 * 1306 * On entry, @p *unitp is the desired unit number (or @c -1 if any 1307 * will do). The allocated unit number is returned in @p *unitp. 1308 1309 * @param dc the devclass to allocate from 1310 * @param unitp points at the location for the allocated unit 1311 * number 1312 * 1313 * @retval 0 success 1314 * @retval EEXIST the requested unit number is already allocated 1315 * @retval ENOMEM memory allocation failure 1316 */ 1317static int 1318devclass_alloc_unit(devclass_t dc, int *unitp) 1319{ 1320 int unit = *unitp; 1321 1322 PDEBUG(("unit %d in devclass %s", unit, DEVCLANAME(dc))); 1323 1324 /* If we were given a wired unit number, check for existing device */ 1325 /* XXX imp XXX */ 1326 if (unit != -1) { 1327 if (unit >= 0 && unit < dc->maxunit && 1328 dc->devices[unit] != NULL) { 1329 if (bootverbose) 1330 printf("%s: %s%d already exists; skipping it\n", 1331 dc->name, dc->name, *unitp); 1332 return (EEXIST); 1333 } 1334 } else { 1335 /* Unwired device, find the next available slot for it */ 1336 unit = 0; 1337 while (unit < dc->maxunit && dc->devices[unit] != NULL) 1338 unit++; 1339 } 1340 1341 /* 1342 * We've selected a unit beyond the length of the table, so let's 1343 * extend the table to make room for all units up to and including 1344 * this one. 1345 */ 1346 if (unit >= dc->maxunit) { 1347 device_t *newlist; 1348 int newsize; 1349 1350 newsize = roundup((unit + 1), MINALLOCSIZE / sizeof(device_t)); 1351 newlist = malloc(sizeof(device_t) * newsize, M_BUS, M_NOWAIT); 1352 if (!newlist) 1353 return (ENOMEM); 1354 bcopy(dc->devices, newlist, sizeof(device_t) * dc->maxunit); 1355 bzero(newlist + dc->maxunit, 1356 sizeof(device_t) * (newsize - dc->maxunit)); 1357 if (dc->devices) 1358 free(dc->devices, M_BUS); 1359 dc->devices = newlist; 1360 dc->maxunit = newsize; 1361 } 1362 PDEBUG(("now: unit %d in devclass %s", unit, DEVCLANAME(dc))); 1363 1364 *unitp = unit; 1365 return (0); 1366} 1367 1368/** 1369 * @internal 1370 * @brief Add a device to a devclass 1371 * 1372 * A unit number is allocated for the device (using the device's 1373 * preferred unit number if any) and the device is registered in the 1374 * devclass. This allows the device to be looked up by its unit 1375 * number, e.g. by decoding a dev_t minor number. 1376 * 1377 * @param dc the devclass to add to 1378 * @param dev the device to add 1379 * 1380 * @retval 0 success 1381 * @retval EEXIST the requested unit number is already allocated 1382 * @retval ENOMEM memory allocation failure 1383 */ 1384static int 1385devclass_add_device(devclass_t dc, device_t dev) 1386{ 1387 int buflen, error; 1388 1389 PDEBUG(("%s in devclass %s", DEVICENAME(dev), DEVCLANAME(dc))); 1390 1391 buflen = snprintf(NULL, 0, "%s%d$", dc->name, dev->unit); 1392 if (buflen < 0) 1393 return (ENOMEM); 1394 dev->nameunit = malloc(buflen, M_BUS, M_NOWAIT|M_ZERO); 1395 if (!dev->nameunit) 1396 return (ENOMEM); 1397 1398 if ((error = devclass_alloc_unit(dc, &dev->unit)) != 0) { 1399 free(dev->nameunit, M_BUS); 1400 dev->nameunit = NULL; 1401 return (error); 1402 } 1403 dc->devices[dev->unit] = dev; 1404 dev->devclass = dc; 1405 snprintf(dev->nameunit, buflen, "%s%d", dc->name, dev->unit); 1406 1407 return (0); 1408} 1409 1410/** 1411 * @internal 1412 * @brief Delete a device from a devclass 1413 * 1414 * The device is removed from the devclass's device list and its unit 1415 * number is freed. 1416 1417 * @param dc the devclass to delete from 1418 * @param dev the device to delete 1419 * 1420 * @retval 0 success 1421 */ 1422static int 1423devclass_delete_device(devclass_t dc, device_t dev) 1424{ 1425 if (!dc || !dev) 1426 return (0); 1427 1428 PDEBUG(("%s in devclass %s", DEVICENAME(dev), DEVCLANAME(dc))); 1429 1430 if (dev->devclass != dc || dc->devices[dev->unit] != dev) 1431 panic("devclass_delete_device: inconsistent device class"); 1432 dc->devices[dev->unit] = NULL; 1433 if (dev->flags & DF_WILDCARD) 1434 dev->unit = -1; 1435 dev->devclass = NULL; 1436 free(dev->nameunit, M_BUS); 1437 dev->nameunit = NULL; 1438 1439 return (0); 1440} 1441 1442/** 1443 * @internal 1444 * @brief Make a new device and add it as a child of @p parent 1445 * 1446 * @param parent the parent of the new device 1447 * @param name the devclass name of the new device or @c NULL 1448 * to leave the devclass unspecified 1449 * @parem unit the unit number of the new device of @c -1 to 1450 * leave the unit number unspecified 1451 * 1452 * @returns the new device 1453 */ 1454static device_t 1455make_device(device_t parent, const char *name, int unit) 1456{ 1457 device_t dev; 1458 devclass_t dc; 1459 1460 PDEBUG(("%s at %s as unit %d", name, DEVICENAME(parent), unit)); 1461 1462 if (name) { 1463 dc = devclass_find_internal(name, NULL, TRUE); 1464 if (!dc) { 1465 printf("make_device: can't find device class %s\n", 1466 name); 1467 return (NULL); 1468 } 1469 } else { 1470 dc = NULL; 1471 } 1472 1473 dev = malloc(sizeof(struct device), M_BUS, M_NOWAIT|M_ZERO); 1474 if (!dev) 1475 return (NULL); 1476 1477 dev->parent = parent; 1478 TAILQ_INIT(&dev->children); 1479 kobj_init((kobj_t) dev, &null_class); 1480 dev->driver = NULL; 1481 dev->devclass = NULL; 1482 dev->unit = unit; 1483 dev->nameunit = NULL; 1484 dev->desc = NULL; 1485 dev->busy = 0; 1486 dev->devflags = 0; 1487 dev->flags = DF_ENABLED; 1488 dev->order = 0; 1489 if (unit == -1) 1490 dev->flags |= DF_WILDCARD; 1491 if (name) { 1492 dev->flags |= DF_FIXEDCLASS; 1493 if (devclass_add_device(dc, dev)) { 1494 kobj_delete((kobj_t) dev, M_BUS); 1495 return (NULL); 1496 } 1497 } 1498 dev->ivars = NULL; 1499 dev->softc = NULL; 1500 1501 dev->state = DS_NOTPRESENT; 1502 1503 TAILQ_INSERT_TAIL(&bus_data_devices, dev, devlink); 1504 bus_data_generation_update(); 1505 1506 return (dev); 1507} 1508 1509/** 1510 * @internal 1511 * @brief Print a description of a device. 1512 */ 1513static int 1514device_print_child(device_t dev, device_t child) 1515{ 1516 int retval = 0; 1517 1518 if (device_is_alive(child)) 1519 retval += BUS_PRINT_CHILD(dev, child); 1520 else 1521 retval += device_printf(child, " not found\n"); 1522 1523 return (retval); 1524} 1525 1526/** 1527 * @brief Create a new device 1528 * 1529 * This creates a new device and adds it as a child of an existing 1530 * parent device. The new device will be added after the last existing 1531 * child with order zero. 1532 * 1533 * @param dev the device which will be the parent of the 1534 * new child device 1535 * @param name devclass name for new device or @c NULL if not 1536 * specified 1537 * @param unit unit number for new device or @c -1 if not 1538 * specified 1539 * 1540 * @returns the new device 1541 */ 1542device_t 1543device_add_child(device_t dev, const char *name, int unit) 1544{ 1545 return (device_add_child_ordered(dev, 0, name, unit)); 1546} 1547 1548/** 1549 * @brief Create a new device 1550 * 1551 * This creates a new device and adds it as a child of an existing 1552 * parent device. The new device will be added after the last existing 1553 * child with the same order. 1554 * 1555 * @param dev the device which will be the parent of the 1556 * new child device 1557 * @param order a value which is used to partially sort the 1558 * children of @p dev - devices created using 1559 * lower values of @p order appear first in @p 1560 * dev's list of children 1561 * @param name devclass name for new device or @c NULL if not 1562 * specified 1563 * @param unit unit number for new device or @c -1 if not 1564 * specified 1565 * 1566 * @returns the new device 1567 */ 1568device_t 1569device_add_child_ordered(device_t dev, int order, const char *name, int unit) 1570{ 1571 device_t child; 1572 device_t place; 1573 1574 PDEBUG(("%s at %s with order %d as unit %d", 1575 name, DEVICENAME(dev), order, unit)); 1576 1577 child = make_device(dev, name, unit); 1578 if (child == NULL) 1579 return (child); 1580 child->order = order; 1581 1582 TAILQ_FOREACH(place, &dev->children, link) { 1583 if (place->order > order) 1584 break; 1585 } 1586 1587 if (place) { 1588 /* 1589 * The device 'place' is the first device whose order is 1590 * greater than the new child. 1591 */ 1592 TAILQ_INSERT_BEFORE(place, child, link); 1593 } else { 1594 /* 1595 * The new child's order is greater or equal to the order of 1596 * any existing device. Add the child to the tail of the list. 1597 */ 1598 TAILQ_INSERT_TAIL(&dev->children, child, link); 1599 } 1600 1601 bus_data_generation_update(); 1602 return (child); 1603} 1604 1605/** 1606 * @brief Delete a device 1607 * 1608 * This function deletes a device along with all of its children. If 1609 * the device currently has a driver attached to it, the device is 1610 * detached first using device_detach(). 1611 * 1612 * @param dev the parent device 1613 * @param child the device to delete 1614 * 1615 * @retval 0 success 1616 * @retval non-zero a unit error code describing the error 1617 */ 1618int 1619device_delete_child(device_t dev, device_t child) 1620{ 1621 int error; 1622 device_t grandchild; 1623 1624 PDEBUG(("%s from %s", DEVICENAME(child), DEVICENAME(dev))); 1625 1626 /* remove children first */ 1627 while ( (grandchild = TAILQ_FIRST(&child->children)) ) { 1628 error = device_delete_child(child, grandchild); 1629 if (error) 1630 return (error); 1631 } 1632 1633 if ((error = device_detach(child)) != 0) 1634 return (error); 1635 if (child->devclass) 1636 devclass_delete_device(child->devclass, child); 1637 TAILQ_REMOVE(&dev->children, child, link); 1638 TAILQ_REMOVE(&bus_data_devices, child, devlink); 1639 kobj_delete((kobj_t) child, M_BUS); 1640 1641 bus_data_generation_update(); 1642 return (0); 1643} 1644 1645/** 1646 * @brief Find a device given a unit number 1647 * 1648 * This is similar to devclass_get_devices() but only searches for 1649 * devices which have @p dev as a parent. 1650 * 1651 * @param dev the parent device to search 1652 * @param unit the unit number to search for. If the unit is -1, 1653 * return the first child of @p dev which has name 1654 * @p classname (that is, the one with the lowest unit.) 1655 * 1656 * @returns the device with the given unit number or @c 1657 * NULL if there is no such device 1658 */ 1659device_t 1660device_find_child(device_t dev, const char *classname, int unit) 1661{ 1662 devclass_t dc; 1663 device_t child; 1664 1665 dc = devclass_find(classname); 1666 if (!dc) 1667 return (NULL); 1668 1669 if (unit != -1) { 1670 child = devclass_get_device(dc, unit); 1671 if (child && child->parent == dev) 1672 return (child); 1673 } else { 1674 for (unit = 0; unit < devclass_get_maxunit(dc); unit++) { 1675 child = devclass_get_device(dc, unit); 1676 if (child && child->parent == dev) 1677 return (child); 1678 } 1679 } 1680 return (NULL); 1681} 1682 1683/** 1684 * @internal 1685 */ 1686static driverlink_t 1687first_matching_driver(devclass_t dc, device_t dev) 1688{ 1689 if (dev->devclass) 1690 return (devclass_find_driver_internal(dc, dev->devclass->name)); 1691 return (TAILQ_FIRST(&dc->drivers)); 1692} 1693 1694/** 1695 * @internal 1696 */ 1697static driverlink_t 1698next_matching_driver(devclass_t dc, device_t dev, driverlink_t last) 1699{ 1700 if (dev->devclass) { 1701 driverlink_t dl; 1702 for (dl = TAILQ_NEXT(last, link); dl; dl = TAILQ_NEXT(dl, link)) 1703 if (!strcmp(dev->devclass->name, dl->driver->name)) 1704 return (dl); 1705 return (NULL); 1706 } 1707 return (TAILQ_NEXT(last, link)); 1708} 1709 1710/** 1711 * @internal 1712 */ 1713int 1714device_probe_child(device_t dev, device_t child) 1715{ 1716 devclass_t dc; 1717 driverlink_t best = NULL; 1718 driverlink_t dl; 1719 int result, pri = 0; 1720 int hasclass = (child->devclass != 0); 1721 1722 GIANT_REQUIRED; 1723 1724 dc = dev->devclass; 1725 if (!dc) 1726 panic("device_probe_child: parent device has no devclass"); 1727 1728 /* 1729 * If the state is already probed, then return. However, don't 1730 * return if we can rebid this object. 1731 */ 1732 if (child->state == DS_ALIVE && (child->flags & DF_REBID) == 0) 1733 return (0); 1734 1735 for (; dc; dc = dc->parent) { 1736 for (dl = first_matching_driver(dc, child); 1737 dl; 1738 dl = next_matching_driver(dc, child, dl)) { 1739 PDEBUG(("Trying %s", DRIVERNAME(dl->driver))); 1740 device_set_driver(child, dl->driver); 1741 if (!hasclass) 1742 device_set_devclass(child, dl->driver->name); 1743 1744 /* Fetch any flags for the device before probing. */ 1745 resource_int_value(dl->driver->name, child->unit, 1746 "flags", &child->devflags); 1747 1748 result = DEVICE_PROBE(child); 1749 1750 /* Reset flags and devclass before the next probe. */ 1751 child->devflags = 0; 1752 if (!hasclass) 1753 device_set_devclass(child, NULL); 1754 1755 /* 1756 * If the driver returns SUCCESS, there can be 1757 * no higher match for this device. 1758 */ 1759 if (result == 0) { 1760 best = dl; 1761 pri = 0; 1762 break; 1763 } 1764 1765 /* 1766 * The driver returned an error so it 1767 * certainly doesn't match. 1768 */ 1769 if (result > 0) { 1770 device_set_driver(child, NULL); 1771 continue; 1772 } 1773 1774 /* 1775 * A priority lower than SUCCESS, remember the 1776 * best matching driver. Initialise the value 1777 * of pri for the first match. 1778 */ 1779 if (best == NULL || result > pri) { 1780 /* 1781 * Probes that return BUS_PROBE_NOWILDCARD 1782 * or lower only match when they are set 1783 * in stone by the parent bus. 1784 */ 1785 if (result <= BUS_PROBE_NOWILDCARD && 1786 child->flags & DF_WILDCARD) 1787 continue; 1788 best = dl; 1789 pri = result; 1790 continue; 1791 } 1792 } 1793 /* 1794 * If we have an unambiguous match in this devclass, 1795 * don't look in the parent. 1796 */ 1797 if (best && pri == 0) 1798 break; 1799 } 1800 1801 /* 1802 * If we found a driver, change state and initialise the devclass. 1803 */ 1804 /* XXX What happens if we rebid and got no best? */ 1805 if (best) { 1806 /* 1807 * If this device was atached, and we were asked to 1808 * rescan, and it is a different driver, then we have 1809 * to detach the old driver and reattach this new one. 1810 * Note, we don't have to check for DF_REBID here 1811 * because if the state is > DS_ALIVE, we know it must 1812 * be. 1813 * 1814 * This assumes that all DF_REBID drivers can have 1815 * their probe routine called at any time and that 1816 * they are idempotent as well as completely benign in 1817 * normal operations. 1818 * 1819 * We also have to make sure that the detach 1820 * succeeded, otherwise we fail the operation (or 1821 * maybe it should just fail silently? I'm torn). 1822 */ 1823 if (child->state > DS_ALIVE && best->driver != child->driver) 1824 if ((result = device_detach(dev)) != 0) 1825 return (result); 1826 1827 /* Set the winning driver, devclass, and flags. */ 1828 if (!child->devclass) 1829 device_set_devclass(child, best->driver->name); 1830 device_set_driver(child, best->driver); 1831 resource_int_value(best->driver->name, child->unit, 1832 "flags", &child->devflags); 1833 1834 if (pri < 0) { 1835 /* 1836 * A bit bogus. Call the probe method again to make 1837 * sure that we have the right description. 1838 */ 1839 DEVICE_PROBE(child); 1840#if 0 1841 child->flags |= DF_REBID; 1842#endif 1843 } else 1844 child->flags &= ~DF_REBID; 1845 child->state = DS_ALIVE; 1846 1847 bus_data_generation_update(); 1848 return (0); 1849 } 1850 1851 return (ENXIO); 1852} 1853 1854/** 1855 * @brief Return the parent of a device 1856 */ 1857device_t 1858device_get_parent(device_t dev) 1859{ 1860 return (dev->parent); 1861} 1862 1863/** 1864 * @brief Get a list of children of a device 1865 * 1866 * An array containing a list of all the children of the given device 1867 * is allocated and returned in @p *devlistp. The number of devices 1868 * in the array is returned in @p *devcountp. The caller should free 1869 * the array using @c free(p, M_TEMP). 1870 * 1871 * @param dev the device to examine 1872 * @param devlistp points at location for array pointer return 1873 * value 1874 * @param devcountp points at location for array size return value 1875 * 1876 * @retval 0 success 1877 * @retval ENOMEM the array allocation failed 1878 */ 1879int 1880device_get_children(device_t dev, device_t **devlistp, int *devcountp) 1881{ 1882 int count; 1883 device_t child; 1884 device_t *list; 1885 1886 count = 0; 1887 TAILQ_FOREACH(child, &dev->children, link) { 1888 count++; 1889 } 1890 1891 list = malloc(count * sizeof(device_t), M_TEMP, M_NOWAIT|M_ZERO); 1892 if (!list) 1893 return (ENOMEM); 1894 1895 count = 0; 1896 TAILQ_FOREACH(child, &dev->children, link) { 1897 list[count] = child; 1898 count++; 1899 } 1900 1901 *devlistp = list; 1902 *devcountp = count; 1903 1904 return (0); 1905} 1906 1907/** 1908 * @brief Return the current driver for the device or @c NULL if there 1909 * is no driver currently attached 1910 */ 1911driver_t * 1912device_get_driver(device_t dev) 1913{ 1914 return (dev->driver); 1915} 1916 1917/** 1918 * @brief Return the current devclass for the device or @c NULL if 1919 * there is none. 1920 */ 1921devclass_t 1922device_get_devclass(device_t dev) 1923{ 1924 return (dev->devclass); 1925} 1926 1927/** 1928 * @brief Return the name of the device's devclass or @c NULL if there 1929 * is none. 1930 */ 1931const char * 1932device_get_name(device_t dev) 1933{ 1934 if (dev != NULL && dev->devclass) 1935 return (devclass_get_name(dev->devclass)); 1936 return (NULL); 1937} 1938 1939/** 1940 * @brief Return a string containing the device's devclass name 1941 * followed by an ascii representation of the device's unit number 1942 * (e.g. @c "foo2"). 1943 */ 1944const char * 1945device_get_nameunit(device_t dev) 1946{ 1947 return (dev->nameunit); 1948} 1949 1950/** 1951 * @brief Return the device's unit number. 1952 */ 1953int 1954device_get_unit(device_t dev) 1955{ 1956 return (dev->unit); 1957} 1958 1959/** 1960 * @brief Return the device's description string 1961 */ 1962const char * 1963device_get_desc(device_t dev) 1964{ 1965 return (dev->desc); 1966} 1967 1968/** 1969 * @brief Return the device's flags 1970 */ 1971u_int32_t 1972device_get_flags(device_t dev) 1973{ 1974 return (dev->devflags); 1975} 1976 1977struct sysctl_ctx_list * 1978device_get_sysctl_ctx(device_t dev) 1979{ 1980 return (&dev->sysctl_ctx); 1981} 1982 1983struct sysctl_oid * 1984device_get_sysctl_tree(device_t dev) 1985{ 1986 return (dev->sysctl_tree); 1987} 1988 1989/** 1990 * @brief Print the name of the device followed by a colon and a space 1991 * 1992 * @returns the number of characters printed 1993 */ 1994int 1995device_print_prettyname(device_t dev) 1996{ 1997 const char *name = device_get_name(dev); 1998 1999 if (name == 0) 2000 return (printf("unknown: ")); 2001 return (printf("%s%d: ", name, device_get_unit(dev))); 2002} 2003 2004/** 2005 * @brief Print the name of the device followed by a colon, a space 2006 * and the result of calling vprintf() with the value of @p fmt and 2007 * the following arguments. 2008 * 2009 * @returns the number of characters printed 2010 */ 2011int 2012device_printf(device_t dev, const char * fmt, ...) 2013{ 2014 va_list ap; 2015 int retval; 2016 2017 retval = device_print_prettyname(dev); 2018 va_start(ap, fmt); 2019 retval += vprintf(fmt, ap); 2020 va_end(ap); 2021 return (retval); 2022} 2023 2024/** 2025 * @internal 2026 */ 2027static void 2028device_set_desc_internal(device_t dev, const char* desc, int copy) 2029{ 2030 if (dev->desc && (dev->flags & DF_DESCMALLOCED)) { 2031 free(dev->desc, M_BUS); 2032 dev->flags &= ~DF_DESCMALLOCED; 2033 dev->desc = NULL; 2034 } 2035 2036 if (copy && desc) { 2037 dev->desc = malloc(strlen(desc) + 1, M_BUS, M_NOWAIT); 2038 if (dev->desc) { 2039 strcpy(dev->desc, desc); 2040 dev->flags |= DF_DESCMALLOCED; 2041 } 2042 } else { 2043 /* Avoid a -Wcast-qual warning */ 2044 dev->desc = (char *)(uintptr_t) desc; 2045 } 2046 2047 bus_data_generation_update(); 2048} 2049 2050/** 2051 * @brief Set the device's description 2052 * 2053 * The value of @c desc should be a string constant that will not 2054 * change (at least until the description is changed in a subsequent 2055 * call to device_set_desc() or device_set_desc_copy()). 2056 */ 2057void 2058device_set_desc(device_t dev, const char* desc) 2059{ 2060 device_set_desc_internal(dev, desc, FALSE); 2061} 2062 2063/** 2064 * @brief Set the device's description 2065 * 2066 * The string pointed to by @c desc is copied. Use this function if 2067 * the device description is generated, (e.g. with sprintf()). 2068 */ 2069void 2070device_set_desc_copy(device_t dev, const char* desc) 2071{ 2072 device_set_desc_internal(dev, desc, TRUE); 2073} 2074 2075/** 2076 * @brief Set the device's flags 2077 */ 2078void 2079device_set_flags(device_t dev, u_int32_t flags) 2080{ 2081 dev->devflags = flags; 2082} 2083 2084/** 2085 * @brief Return the device's softc field 2086 * 2087 * The softc is allocated and zeroed when a driver is attached, based 2088 * on the size field of the driver. 2089 */ 2090void * 2091device_get_softc(device_t dev) 2092{ 2093 return (dev->softc); 2094} 2095 2096/** 2097 * @brief Set the device's softc field 2098 * 2099 * Most drivers do not need to use this since the softc is allocated 2100 * automatically when the driver is attached. 2101 */ 2102void 2103device_set_softc(device_t dev, void *softc) 2104{ 2105 if (dev->softc && !(dev->flags & DF_EXTERNALSOFTC)) 2106 free(dev->softc, M_BUS_SC); 2107 dev->softc = softc; 2108 if (dev->softc) 2109 dev->flags |= DF_EXTERNALSOFTC; 2110 else 2111 dev->flags &= ~DF_EXTERNALSOFTC; 2112} 2113 2114/** 2115 * @brief Get the device's ivars field 2116 * 2117 * The ivars field is used by the parent device to store per-device 2118 * state (e.g. the physical location of the device or a list of 2119 * resources). 2120 */ 2121void * 2122device_get_ivars(device_t dev) 2123{ 2124 2125 KASSERT(dev != NULL, ("device_get_ivars(NULL, ...)")); 2126 return (dev->ivars); 2127} 2128 2129/** 2130 * @brief Set the device's ivars field 2131 */ 2132void 2133device_set_ivars(device_t dev, void * ivars) 2134{ 2135 2136 KASSERT(dev != NULL, ("device_set_ivars(NULL, ...)")); 2137 dev->ivars = ivars; 2138} 2139 2140/** 2141 * @brief Return the device's state 2142 */ 2143device_state_t 2144device_get_state(device_t dev) 2145{ 2146 return (dev->state); 2147} 2148 2149/** 2150 * @brief Set the DF_ENABLED flag for the device 2151 */ 2152void 2153device_enable(device_t dev) 2154{ 2155 dev->flags |= DF_ENABLED; 2156} 2157 2158/** 2159 * @brief Clear the DF_ENABLED flag for the device 2160 */ 2161void 2162device_disable(device_t dev) 2163{ 2164 dev->flags &= ~DF_ENABLED; 2165} 2166 2167/** 2168 * @brief Increment the busy counter for the device 2169 */ 2170void 2171device_busy(device_t dev) 2172{ 2173 if (dev->state < DS_ATTACHED) 2174 panic("device_busy: called for unattached device"); 2175 if (dev->busy == 0 && dev->parent) 2176 device_busy(dev->parent); 2177 dev->busy++; 2178 dev->state = DS_BUSY; 2179} 2180 2181/** 2182 * @brief Decrement the busy counter for the device 2183 */ 2184void 2185device_unbusy(device_t dev) 2186{ 2187 if (dev->state != DS_BUSY) 2188 panic("device_unbusy: called for non-busy device %s", 2189 device_get_nameunit(dev)); 2190 dev->busy--; 2191 if (dev->busy == 0) { 2192 if (dev->parent) 2193 device_unbusy(dev->parent); 2194 dev->state = DS_ATTACHED; 2195 } 2196} 2197 2198/** 2199 * @brief Set the DF_QUIET flag for the device 2200 */ 2201void 2202device_quiet(device_t dev) 2203{ 2204 dev->flags |= DF_QUIET; 2205} 2206 2207/** 2208 * @brief Clear the DF_QUIET flag for the device 2209 */ 2210void 2211device_verbose(device_t dev) 2212{ 2213 dev->flags &= ~DF_QUIET; 2214} 2215 2216/** 2217 * @brief Return non-zero if the DF_QUIET flag is set on the device 2218 */ 2219int 2220device_is_quiet(device_t dev) 2221{ 2222 return ((dev->flags & DF_QUIET) != 0); 2223} 2224 2225/** 2226 * @brief Return non-zero if the DF_ENABLED flag is set on the device 2227 */ 2228int 2229device_is_enabled(device_t dev) 2230{ 2231 return ((dev->flags & DF_ENABLED) != 0); 2232} 2233 2234/** 2235 * @brief Return non-zero if the device was successfully probed 2236 */ 2237int 2238device_is_alive(device_t dev) 2239{ 2240 return (dev->state >= DS_ALIVE); 2241} 2242 2243/** 2244 * @brief Return non-zero if the device currently has a driver 2245 * attached to it 2246 */ 2247int 2248device_is_attached(device_t dev) 2249{ 2250 return (dev->state >= DS_ATTACHED); 2251} 2252 2253/** 2254 * @brief Set the devclass of a device 2255 * @see devclass_add_device(). 2256 */ 2257int 2258device_set_devclass(device_t dev, const char *classname) 2259{ 2260 devclass_t dc; 2261 int error; 2262 2263 if (!classname) { 2264 if (dev->devclass) 2265 devclass_delete_device(dev->devclass, dev); 2266 return (0); 2267 } 2268 2269 if (dev->devclass) { 2270 printf("device_set_devclass: device class already set\n"); 2271 return (EINVAL); 2272 } 2273 2274 dc = devclass_find_internal(classname, NULL, TRUE); 2275 if (!dc) 2276 return (ENOMEM); 2277 2278 error = devclass_add_device(dc, dev); 2279 2280 bus_data_generation_update(); 2281 return (error); 2282} 2283 2284/** 2285 * @brief Set the driver of a device 2286 * 2287 * @retval 0 success 2288 * @retval EBUSY the device already has a driver attached 2289 * @retval ENOMEM a memory allocation failure occurred 2290 */ 2291int 2292device_set_driver(device_t dev, driver_t *driver) 2293{ 2294 if (dev->state >= DS_ATTACHED) 2295 return (EBUSY); 2296 2297 if (dev->driver == driver) 2298 return (0); 2299 2300 if (dev->softc && !(dev->flags & DF_EXTERNALSOFTC)) { 2301 free(dev->softc, M_BUS_SC); 2302 dev->softc = NULL; 2303 } 2304 kobj_delete((kobj_t) dev, NULL); 2305 dev->driver = driver; 2306 if (driver) { 2307 kobj_init((kobj_t) dev, (kobj_class_t) driver); 2308 if (!(dev->flags & DF_EXTERNALSOFTC) && driver->size > 0) { 2309 dev->softc = malloc(driver->size, M_BUS_SC, 2310 M_NOWAIT | M_ZERO); 2311 if (!dev->softc) { 2312 kobj_delete((kobj_t) dev, NULL); 2313 kobj_init((kobj_t) dev, &null_class); 2314 dev->driver = NULL; 2315 return (ENOMEM); 2316 } 2317 } 2318 } else { 2319 kobj_init((kobj_t) dev, &null_class); 2320 } 2321 2322 bus_data_generation_update(); 2323 return (0); 2324} 2325 2326/** 2327 * @brief Probe a device and attach a driver if possible 2328 * 2329 * This function is the core of the device autoconfiguration 2330 * system. Its purpose is to select a suitable driver for a device and 2331 * then call that driver to initialise the hardware appropriately. The 2332 * driver is selected by calling the DEVICE_PROBE() method of a set of 2333 * candidate drivers and then choosing the driver which returned the 2334 * best value. This driver is then attached to the device using 2335 * device_attach(). 2336 * 2337 * The set of suitable drivers is taken from the list of drivers in 2338 * the parent device's devclass. If the device was originally created 2339 * with a specific class name (see device_add_child()), only drivers 2340 * with that name are probed, otherwise all drivers in the devclass 2341 * are probed. If no drivers return successful probe values in the 2342 * parent devclass, the search continues in the parent of that 2343 * devclass (see devclass_get_parent()) if any. 2344 * 2345 * @param dev the device to initialise 2346 * 2347 * @retval 0 success 2348 * @retval ENXIO no driver was found 2349 * @retval ENOMEM memory allocation failure 2350 * @retval non-zero some other unix error code 2351 */ 2352int 2353device_probe_and_attach(device_t dev) 2354{ 2355 int error; 2356 2357 GIANT_REQUIRED; 2358 2359 if (dev->state >= DS_ALIVE && (dev->flags & DF_REBID) == 0) 2360 return (0); 2361 2362 if (!(dev->flags & DF_ENABLED)) { 2363 if (bootverbose && device_get_name(dev) != NULL) { 2364 device_print_prettyname(dev); 2365 printf("not probed (disabled)\n"); 2366 } 2367 return (0); 2368 } 2369 if ((error = device_probe_child(dev->parent, dev)) != 0) { 2370 if (!(dev->flags & DF_DONENOMATCH)) { 2371 BUS_PROBE_NOMATCH(dev->parent, dev); 2372 devnomatch(dev); 2373 dev->flags |= DF_DONENOMATCH; 2374 } 2375 return (error); 2376 } 2377 error = device_attach(dev); 2378 2379 return (error); 2380} 2381 2382/** 2383 * @brief Attach a device driver to a device 2384 * 2385 * This function is a wrapper around the DEVICE_ATTACH() driver 2386 * method. In addition to calling DEVICE_ATTACH(), it initialises the 2387 * device's sysctl tree, optionally prints a description of the device 2388 * and queues a notification event for user-based device management 2389 * services. 2390 * 2391 * Normally this function is only called internally from 2392 * device_probe_and_attach(). 2393 * 2394 * @param dev the device to initialise 2395 * 2396 * @retval 0 success 2397 * @retval ENXIO no driver was found 2398 * @retval ENOMEM memory allocation failure 2399 * @retval non-zero some other unix error code 2400 */ 2401int 2402device_attach(device_t dev) 2403{ 2404 int error; 2405 2406 device_sysctl_init(dev); 2407 if (!device_is_quiet(dev)) 2408 device_print_child(dev->parent, dev); 2409 if ((error = DEVICE_ATTACH(dev)) != 0) { 2410 printf("device_attach: %s%d attach returned %d\n", 2411 dev->driver->name, dev->unit, error); 2412 /* Unset the class; set in device_probe_child */ 2413 if (dev->devclass == NULL) 2414 device_set_devclass(dev, NULL); 2415 device_set_driver(dev, NULL); 2416 device_sysctl_fini(dev); 2417 dev->state = DS_NOTPRESENT; 2418 return (error); 2419 } 2420 device_sysctl_update(dev); 2421 dev->state = DS_ATTACHED; 2422 devadded(dev); 2423 return (0); 2424} 2425 2426/** 2427 * @brief Detach a driver from a device 2428 * 2429 * This function is a wrapper around the DEVICE_DETACH() driver 2430 * method. If the call to DEVICE_DETACH() succeeds, it calls 2431 * BUS_CHILD_DETACHED() for the parent of @p dev, queues a 2432 * notification event for user-based device management services and 2433 * cleans up the device's sysctl tree. 2434 * 2435 * @param dev the device to un-initialise 2436 * 2437 * @retval 0 success 2438 * @retval ENXIO no driver was found 2439 * @retval ENOMEM memory allocation failure 2440 * @retval non-zero some other unix error code 2441 */ 2442int 2443device_detach(device_t dev) 2444{ 2445 int error; 2446 2447 GIANT_REQUIRED; 2448 2449 PDEBUG(("%s", DEVICENAME(dev))); 2450 if (dev->state == DS_BUSY) 2451 return (EBUSY); 2452 if (dev->state != DS_ATTACHED) 2453 return (0); 2454 2455 if ((error = DEVICE_DETACH(dev)) != 0) 2456 return (error); 2457 devremoved(dev); 2458 device_printf(dev, "detached\n"); 2459 if (dev->parent) 2460 BUS_CHILD_DETACHED(dev->parent, dev); 2461 2462 if (!(dev->flags & DF_FIXEDCLASS)) 2463 devclass_delete_device(dev->devclass, dev); 2464 2465 dev->state = DS_NOTPRESENT; 2466 device_set_driver(dev, NULL); 2467 device_set_desc(dev, NULL); 2468 device_sysctl_fini(dev); 2469 2470 return (0); 2471} 2472 2473/** 2474 * @brief Tells a driver to quiesce itself. 2475 * 2476 * This function is a wrapper around the DEVICE_QUIESCE() driver 2477 * method. If the call to DEVICE_QUIESCE() succeeds. 2478 * 2479 * @param dev the device to quiesce 2480 * 2481 * @retval 0 success 2482 * @retval ENXIO no driver was found 2483 * @retval ENOMEM memory allocation failure 2484 * @retval non-zero some other unix error code 2485 */ 2486int 2487device_quiesce(device_t dev) 2488{ 2489 2490 PDEBUG(("%s", DEVICENAME(dev))); 2491 if (dev->state == DS_BUSY) 2492 return (EBUSY); 2493 if (dev->state != DS_ATTACHED) 2494 return (0); 2495 2496 return (DEVICE_QUIESCE(dev)); 2497} 2498 2499/** 2500 * @brief Notify a device of system shutdown 2501 * 2502 * This function calls the DEVICE_SHUTDOWN() driver method if the 2503 * device currently has an attached driver. 2504 * 2505 * @returns the value returned by DEVICE_SHUTDOWN() 2506 */ 2507int 2508device_shutdown(device_t dev) 2509{ 2510 if (dev->state < DS_ATTACHED) 2511 return (0); 2512 return (DEVICE_SHUTDOWN(dev)); 2513} 2514 2515/** 2516 * @brief Set the unit number of a device 2517 * 2518 * This function can be used to override the unit number used for a 2519 * device (e.g. to wire a device to a pre-configured unit number). 2520 */ 2521int 2522device_set_unit(device_t dev, int unit) 2523{ 2524 devclass_t dc; 2525 int err; 2526 2527 dc = device_get_devclass(dev); 2528 if (unit < dc->maxunit && dc->devices[unit]) 2529 return (EBUSY); 2530 err = devclass_delete_device(dc, dev); 2531 if (err) 2532 return (err); 2533 dev->unit = unit; 2534 err = devclass_add_device(dc, dev); 2535 if (err) 2536 return (err); 2537 2538 bus_data_generation_update(); 2539 return (0); 2540} 2541 2542/*======================================*/ 2543/* 2544 * Some useful method implementations to make life easier for bus drivers. 2545 */ 2546 2547/** 2548 * @brief Initialise a resource list. 2549 * 2550 * @param rl the resource list to initialise 2551 */ 2552void 2553resource_list_init(struct resource_list *rl) 2554{ 2555 STAILQ_INIT(rl); 2556} 2557 2558/** 2559 * @brief Reclaim memory used by a resource list. 2560 * 2561 * This function frees the memory for all resource entries on the list 2562 * (if any). 2563 * 2564 * @param rl the resource list to free 2565 */ 2566void 2567resource_list_free(struct resource_list *rl) 2568{ 2569 struct resource_list_entry *rle; 2570 2571 while ((rle = STAILQ_FIRST(rl)) != NULL) { 2572 if (rle->res) 2573 panic("resource_list_free: resource entry is busy"); 2574 STAILQ_REMOVE_HEAD(rl, link); 2575 free(rle, M_BUS); 2576 } 2577} 2578 2579/** 2580 * @brief Add a resource entry. 2581 * 2582 * This function adds a resource entry using the given @p type, @p 2583 * start, @p end and @p count values. A rid value is chosen by 2584 * searching sequentially for the first unused rid starting at zero. 2585 * 2586 * @param rl the resource list to edit 2587 * @param type the resource entry type (e.g. SYS_RES_MEMORY) 2588 * @param start the start address of the resource 2589 * @param end the end address of the resource 2590 * @param count XXX end-start+1 2591 */ 2592int 2593resource_list_add_next(struct resource_list *rl, int type, u_long start, 2594 u_long end, u_long count) 2595{ 2596 int rid; 2597 2598 rid = 0; 2599 while (resource_list_find(rl, type, rid) != NULL) 2600 rid++; 2601 resource_list_add(rl, type, rid, start, end, count); 2602 return (rid); 2603} 2604 2605/** 2606 * @brief Add or modify a resource entry. 2607 * 2608 * If an existing entry exists with the same type and rid, it will be 2609 * modified using the given values of @p start, @p end and @p 2610 * count. If no entry exists, a new one will be created using the 2611 * given values. The resource list entry that matches is then returned. 2612 * 2613 * @param rl the resource list to edit 2614 * @param type the resource entry type (e.g. SYS_RES_MEMORY) 2615 * @param rid the resource identifier 2616 * @param start the start address of the resource 2617 * @param end the end address of the resource 2618 * @param count XXX end-start+1 2619 */ 2620struct resource_list_entry * 2621resource_list_add(struct resource_list *rl, int type, int rid, 2622 u_long start, u_long end, u_long count) 2623{ 2624 struct resource_list_entry *rle; 2625 2626 rle = resource_list_find(rl, type, rid); 2627 if (!rle) { 2628 rle = malloc(sizeof(struct resource_list_entry), M_BUS, 2629 M_NOWAIT); 2630 if (!rle) 2631 panic("resource_list_add: can't record entry"); 2632 STAILQ_INSERT_TAIL(rl, rle, link); 2633 rle->type = type; 2634 rle->rid = rid; 2635 rle->res = NULL; 2636 } 2637 2638 if (rle->res) 2639 panic("resource_list_add: resource entry is busy"); 2640 2641 rle->start = start; 2642 rle->end = end; 2643 rle->count = count; 2644 return (rle); 2645} 2646 2647/** 2648 * @brief Find a resource entry by type and rid. 2649 * 2650 * @param rl the resource list to search 2651 * @param type the resource entry type (e.g. SYS_RES_MEMORY) 2652 * @param rid the resource identifier 2653 * 2654 * @returns the resource entry pointer or NULL if there is no such 2655 * entry. 2656 */ 2657struct resource_list_entry * 2658resource_list_find(struct resource_list *rl, int type, int rid) 2659{ 2660 struct resource_list_entry *rle; 2661 2662 STAILQ_FOREACH(rle, rl, link) { 2663 if (rle->type == type && rle->rid == rid) 2664 return (rle); 2665 } 2666 return (NULL); 2667} 2668 2669/** 2670 * @brief Delete a resource entry. 2671 * 2672 * @param rl the resource list to edit 2673 * @param type the resource entry type (e.g. SYS_RES_MEMORY) 2674 * @param rid the resource identifier 2675 */ 2676void 2677resource_list_delete(struct resource_list *rl, int type, int rid) 2678{ 2679 struct resource_list_entry *rle = resource_list_find(rl, type, rid); 2680 2681 if (rle) { 2682 if (rle->res != NULL) 2683 panic("resource_list_delete: resource has not been released"); 2684 STAILQ_REMOVE(rl, rle, resource_list_entry, link); 2685 free(rle, M_BUS); 2686 } 2687} 2688 2689/** 2690 * @brief Helper function for implementing BUS_ALLOC_RESOURCE() 2691 * 2692 * Implement BUS_ALLOC_RESOURCE() by looking up a resource from the list 2693 * and passing the allocation up to the parent of @p bus. This assumes 2694 * that the first entry of @c device_get_ivars(child) is a struct 2695 * resource_list. This also handles 'passthrough' allocations where a 2696 * child is a remote descendant of bus by passing the allocation up to 2697 * the parent of bus. 2698 * 2699 * Typically, a bus driver would store a list of child resources 2700 * somewhere in the child device's ivars (see device_get_ivars()) and 2701 * its implementation of BUS_ALLOC_RESOURCE() would find that list and 2702 * then call resource_list_alloc() to perform the allocation. 2703 * 2704 * @param rl the resource list to allocate from 2705 * @param bus the parent device of @p child 2706 * @param child the device which is requesting an allocation 2707 * @param type the type of resource to allocate 2708 * @param rid a pointer to the resource identifier 2709 * @param start hint at the start of the resource range - pass 2710 * @c 0UL for any start address 2711 * @param end hint at the end of the resource range - pass 2712 * @c ~0UL for any end address 2713 * @param count hint at the size of range required - pass @c 1 2714 * for any size 2715 * @param flags any extra flags to control the resource 2716 * allocation - see @c RF_XXX flags in 2717 * <sys/rman.h> for details 2718 * 2719 * @returns the resource which was allocated or @c NULL if no 2720 * resource could be allocated 2721 */ 2722struct resource * 2723resource_list_alloc(struct resource_list *rl, device_t bus, device_t child, 2724 int type, int *rid, u_long start, u_long end, u_long count, u_int flags) 2725{ 2726 struct resource_list_entry *rle = NULL; 2727 int passthrough = (device_get_parent(child) != bus); 2728 int isdefault = (start == 0UL && end == ~0UL); 2729 2730 if (passthrough) { 2731 return (BUS_ALLOC_RESOURCE(device_get_parent(bus), child, 2732 type, rid, start, end, count, flags)); 2733 } 2734 2735 rle = resource_list_find(rl, type, *rid); 2736 2737 if (!rle) 2738 return (NULL); /* no resource of that type/rid */ 2739 2740 if (rle->res) 2741 panic("resource_list_alloc: resource entry is busy"); 2742 2743 if (isdefault) { 2744 start = rle->start; 2745 count = ulmax(count, rle->count); 2746 end = ulmax(rle->end, start + count - 1); 2747 } 2748 2749 rle->res = BUS_ALLOC_RESOURCE(device_get_parent(bus), child, 2750 type, rid, start, end, count, flags); 2751 2752 /* 2753 * Record the new range. 2754 */ 2755 if (rle->res) { 2756 rle->start = rman_get_start(rle->res); 2757 rle->end = rman_get_end(rle->res); 2758 rle->count = count; 2759 } 2760 2761 return (rle->res); 2762} 2763 2764/** 2765 * @brief Helper function for implementing BUS_RELEASE_RESOURCE() 2766 * 2767 * Implement BUS_RELEASE_RESOURCE() using a resource list. Normally 2768 * used with resource_list_alloc(). 2769 * 2770 * @param rl the resource list which was allocated from 2771 * @param bus the parent device of @p child 2772 * @param child the device which is requesting a release 2773 * @param type the type of resource to allocate 2774 * @param rid the resource identifier 2775 * @param res the resource to release 2776 * 2777 * @retval 0 success 2778 * @retval non-zero a standard unix error code indicating what 2779 * error condition prevented the operation 2780 */ 2781int 2782resource_list_release(struct resource_list *rl, device_t bus, device_t child, 2783 int type, int rid, struct resource *res) 2784{ 2785 struct resource_list_entry *rle = NULL; 2786 int passthrough = (device_get_parent(child) != bus); 2787 int error; 2788 2789 if (passthrough) { 2790 return (BUS_RELEASE_RESOURCE(device_get_parent(bus), child, 2791 type, rid, res)); 2792 } 2793 2794 rle = resource_list_find(rl, type, rid); 2795 2796 if (!rle) 2797 panic("resource_list_release: can't find resource"); 2798 if (!rle->res) 2799 panic("resource_list_release: resource entry is not busy"); 2800 2801 error = BUS_RELEASE_RESOURCE(device_get_parent(bus), child, 2802 type, rid, res); 2803 if (error) 2804 return (error); 2805 2806 rle->res = NULL; 2807 return (0); 2808} 2809 2810/** 2811 * @brief Print a description of resources in a resource list 2812 * 2813 * Print all resources of a specified type, for use in BUS_PRINT_CHILD(). 2814 * The name is printed if at least one resource of the given type is available. 2815 * The format is used to print resource start and end. 2816 * 2817 * @param rl the resource list to print 2818 * @param name the name of @p type, e.g. @c "memory" 2819 * @param type type type of resource entry to print 2820 * @param format printf(9) format string to print resource 2821 * start and end values 2822 * 2823 * @returns the number of characters printed 2824 */ 2825int 2826resource_list_print_type(struct resource_list *rl, const char *name, int type, 2827 const char *format) 2828{ 2829 struct resource_list_entry *rle; 2830 int printed, retval; 2831 2832 printed = 0; 2833 retval = 0; 2834 /* Yes, this is kinda cheating */ 2835 STAILQ_FOREACH(rle, rl, link) { 2836 if (rle->type == type) { 2837 if (printed == 0) 2838 retval += printf(" %s ", name); 2839 else 2840 retval += printf(","); 2841 printed++; 2842 retval += printf(format, rle->start); 2843 if (rle->count > 1) { 2844 retval += printf("-"); 2845 retval += printf(format, rle->start + 2846 rle->count - 1); 2847 } 2848 } 2849 } 2850 return (retval); 2851} 2852 2853/** 2854 * @brief Releases all the resources in a list. 2855 * 2856 * @param rl The resource list to purge. 2857 * 2858 * @returns nothing 2859 */ 2860void 2861resource_list_purge(struct resource_list *rl) 2862{ 2863 struct resource_list_entry *rle; 2864 2865 while ((rle = STAILQ_FIRST(rl)) != NULL) { 2866 if (rle->res) 2867 bus_release_resource(rman_get_device(rle->res), 2868 rle->type, rle->rid, rle->res); 2869 STAILQ_REMOVE_HEAD(rl, link); 2870 free(rle, M_BUS); 2871 } 2872} 2873 2874device_t 2875bus_generic_add_child(device_t dev, int order, const char *name, int unit) 2876{ 2877 2878 return (device_add_child_ordered(dev, order, name, unit)); 2879} 2880 2881/** 2882 * @brief Helper function for implementing DEVICE_PROBE() 2883 * 2884 * This function can be used to help implement the DEVICE_PROBE() for 2885 * a bus (i.e. a device which has other devices attached to it). It 2886 * calls the DEVICE_IDENTIFY() method of each driver in the device's 2887 * devclass. 2888 */ 2889int 2890bus_generic_probe(device_t dev) 2891{ 2892 devclass_t dc = dev->devclass; 2893 driverlink_t dl; 2894 2895 TAILQ_FOREACH(dl, &dc->drivers, link) { 2896 DEVICE_IDENTIFY(dl->driver, dev); 2897 } 2898 2899 return (0); 2900} 2901 2902/** 2903 * @brief Helper function for implementing DEVICE_ATTACH() 2904 * 2905 * This function can be used to help implement the DEVICE_ATTACH() for 2906 * a bus. It calls device_probe_and_attach() for each of the device's 2907 * children. 2908 */ 2909int 2910bus_generic_attach(device_t dev) 2911{ 2912 device_t child; 2913 2914 TAILQ_FOREACH(child, &dev->children, link) { 2915 device_probe_and_attach(child); 2916 } 2917 2918 return (0); 2919} 2920 2921/** 2922 * @brief Helper function for implementing DEVICE_DETACH() 2923 * 2924 * This function can be used to help implement the DEVICE_DETACH() for 2925 * a bus. It calls device_detach() for each of the device's 2926 * children. 2927 */ 2928int 2929bus_generic_detach(device_t dev) 2930{ 2931 device_t child; 2932 int error; 2933 2934 if (dev->state != DS_ATTACHED) 2935 return (EBUSY); 2936 2937 TAILQ_FOREACH(child, &dev->children, link) { 2938 if ((error = device_detach(child)) != 0) 2939 return (error); 2940 } 2941 2942 return (0); 2943} 2944 2945/** 2946 * @brief Helper function for implementing DEVICE_SHUTDOWN() 2947 * 2948 * This function can be used to help implement the DEVICE_SHUTDOWN() 2949 * for a bus. It calls device_shutdown() for each of the device's 2950 * children. 2951 */ 2952int 2953bus_generic_shutdown(device_t dev) 2954{ 2955 device_t child; 2956 2957 TAILQ_FOREACH(child, &dev->children, link) { 2958 device_shutdown(child); 2959 } 2960 2961 return (0); 2962} 2963 2964/** 2965 * @brief Helper function for implementing DEVICE_SUSPEND() 2966 * 2967 * This function can be used to help implement the DEVICE_SUSPEND() 2968 * for a bus. It calls DEVICE_SUSPEND() for each of the device's 2969 * children. If any call to DEVICE_SUSPEND() fails, the suspend 2970 * operation is aborted and any devices which were suspended are 2971 * resumed immediately by calling their DEVICE_RESUME() methods. 2972 */ 2973int 2974bus_generic_suspend(device_t dev) 2975{ 2976 int error; 2977 device_t child, child2; 2978 2979 TAILQ_FOREACH(child, &dev->children, link) { 2980 error = DEVICE_SUSPEND(child); 2981 if (error) { 2982 for (child2 = TAILQ_FIRST(&dev->children); 2983 child2 && child2 != child; 2984 child2 = TAILQ_NEXT(child2, link)) 2985 DEVICE_RESUME(child2); 2986 return (error); 2987 } 2988 } 2989 return (0); 2990} 2991 2992/** 2993 * @brief Helper function for implementing DEVICE_RESUME() 2994 * 2995 * This function can be used to help implement the DEVICE_RESUME() for 2996 * a bus. It calls DEVICE_RESUME() on each of the device's children. 2997 */ 2998int 2999bus_generic_resume(device_t dev) 3000{ 3001 device_t child; 3002 3003 TAILQ_FOREACH(child, &dev->children, link) { 3004 DEVICE_RESUME(child); 3005 /* if resume fails, there's nothing we can usefully do... */ 3006 } 3007 return (0); 3008} 3009 3010/** 3011 * @brief Helper function for implementing BUS_PRINT_CHILD(). 3012 * 3013 * This function prints the first part of the ascii representation of 3014 * @p child, including its name, unit and description (if any - see 3015 * device_set_desc()). 3016 * 3017 * @returns the number of characters printed 3018 */ 3019int 3020bus_print_child_header(device_t dev, device_t child) 3021{ 3022 int retval = 0; 3023 3024 if (device_get_desc(child)) { 3025 retval += device_printf(child, "<%s>", device_get_desc(child)); 3026 } else { 3027 retval += printf("%s", device_get_nameunit(child)); 3028 } 3029 3030 return (retval); 3031} 3032 3033/** 3034 * @brief Helper function for implementing BUS_PRINT_CHILD(). 3035 * 3036 * This function prints the last part of the ascii representation of 3037 * @p child, which consists of the string @c " on " followed by the 3038 * name and unit of the @p dev. 3039 * 3040 * @returns the number of characters printed 3041 */ 3042int 3043bus_print_child_footer(device_t dev, device_t child) 3044{ 3045 return (printf(" on %s\n", device_get_nameunit(dev))); 3046} 3047 3048/** 3049 * @brief Helper function for implementing BUS_PRINT_CHILD(). 3050 * 3051 * This function simply calls bus_print_child_header() followed by 3052 * bus_print_child_footer(). 3053 * 3054 * @returns the number of characters printed 3055 */ 3056int 3057bus_generic_print_child(device_t dev, device_t child) 3058{ 3059 int retval = 0; 3060 3061 retval += bus_print_child_header(dev, child); 3062 retval += bus_print_child_footer(dev, child); 3063 3064 return (retval); 3065} 3066 3067/** 3068 * @brief Stub function for implementing BUS_READ_IVAR(). 3069 * 3070 * @returns ENOENT 3071 */ 3072int 3073bus_generic_read_ivar(device_t dev, device_t child, int index, 3074 uintptr_t * result) 3075{ 3076 return (ENOENT); 3077} 3078 3079/** 3080 * @brief Stub function for implementing BUS_WRITE_IVAR(). 3081 * 3082 * @returns ENOENT 3083 */ 3084int 3085bus_generic_write_ivar(device_t dev, device_t child, int index, 3086 uintptr_t value) 3087{ 3088 return (ENOENT); 3089} 3090 3091/** 3092 * @brief Stub function for implementing BUS_GET_RESOURCE_LIST(). 3093 * 3094 * @returns NULL 3095 */ 3096struct resource_list * 3097bus_generic_get_resource_list(device_t dev, device_t child) 3098{ 3099 return (NULL); 3100} 3101 3102/** 3103 * @brief Helper function for implementing BUS_DRIVER_ADDED(). 3104 * 3105 * This implementation of BUS_DRIVER_ADDED() simply calls the driver's 3106 * DEVICE_IDENTIFY() method to allow it to add new children to the bus 3107 * and then calls device_probe_and_attach() for each unattached child. 3108 */ 3109void 3110bus_generic_driver_added(device_t dev, driver_t *driver) 3111{ 3112 device_t child; 3113 3114 DEVICE_IDENTIFY(driver, dev); 3115 TAILQ_FOREACH(child, &dev->children, link) { 3116 if (child->state == DS_NOTPRESENT || 3117 (child->flags & DF_REBID)) 3118 device_probe_and_attach(child); 3119 } 3120} 3121 3122/** 3123 * @brief Helper function for implementing BUS_SETUP_INTR(). 3124 * 3125 * This simple implementation of BUS_SETUP_INTR() simply calls the 3126 * BUS_SETUP_INTR() method of the parent of @p dev. 3127 */ 3128int 3129bus_generic_setup_intr(device_t dev, device_t child, struct resource *irq, 3130 int flags, driver_filter_t *filter, driver_intr_t *intr, void *arg, 3131 void **cookiep) 3132{ 3133 /* Propagate up the bus hierarchy until someone handles it. */ 3134 if (dev->parent) 3135 return (BUS_SETUP_INTR(dev->parent, child, irq, flags, 3136 filter, intr, arg, cookiep)); 3137 return (EINVAL); 3138} 3139 3140/** 3141 * @brief Helper function for implementing BUS_TEARDOWN_INTR(). 3142 * 3143 * This simple implementation of BUS_TEARDOWN_INTR() simply calls the 3144 * BUS_TEARDOWN_INTR() method of the parent of @p dev. 3145 */ 3146int 3147bus_generic_teardown_intr(device_t dev, device_t child, struct resource *irq, 3148 void *cookie) 3149{ 3150 /* Propagate up the bus hierarchy until someone handles it. */ 3151 if (dev->parent) 3152 return (BUS_TEARDOWN_INTR(dev->parent, child, irq, cookie)); 3153 return (EINVAL); 3154} 3155 3156/** 3157 * @brief Helper function for implementing BUS_ALLOC_RESOURCE(). 3158 * 3159 * This simple implementation of BUS_ALLOC_RESOURCE() simply calls the 3160 * BUS_ALLOC_RESOURCE() method of the parent of @p dev. 3161 */ 3162struct resource * 3163bus_generic_alloc_resource(device_t dev, device_t child, int type, int *rid, 3164 u_long start, u_long end, u_long count, u_int flags) 3165{ 3166 /* Propagate up the bus hierarchy until someone handles it. */ 3167 if (dev->parent) 3168 return (BUS_ALLOC_RESOURCE(dev->parent, child, type, rid, 3169 start, end, count, flags)); 3170 return (NULL); 3171} 3172 3173/** 3174 * @brief Helper function for implementing BUS_RELEASE_RESOURCE(). 3175 * 3176 * This simple implementation of BUS_RELEASE_RESOURCE() simply calls the 3177 * BUS_RELEASE_RESOURCE() method of the parent of @p dev. 3178 */ 3179int 3180bus_generic_release_resource(device_t dev, device_t child, int type, int rid, 3181 struct resource *r) 3182{ 3183 /* Propagate up the bus hierarchy until someone handles it. */ 3184 if (dev->parent) 3185 return (BUS_RELEASE_RESOURCE(dev->parent, child, type, rid, 3186 r)); 3187 return (EINVAL); 3188} 3189 3190/** 3191 * @brief Helper function for implementing BUS_ACTIVATE_RESOURCE(). 3192 * 3193 * This simple implementation of BUS_ACTIVATE_RESOURCE() simply calls the 3194 * BUS_ACTIVATE_RESOURCE() method of the parent of @p dev. 3195 */ 3196int 3197bus_generic_activate_resource(device_t dev, device_t child, int type, int rid, 3198 struct resource *r) 3199{ 3200 /* Propagate up the bus hierarchy until someone handles it. */ 3201 if (dev->parent) 3202 return (BUS_ACTIVATE_RESOURCE(dev->parent, child, type, rid, 3203 r)); 3204 return (EINVAL); 3205} 3206 3207/** 3208 * @brief Helper function for implementing BUS_DEACTIVATE_RESOURCE(). 3209 * 3210 * This simple implementation of BUS_DEACTIVATE_RESOURCE() simply calls the 3211 * BUS_DEACTIVATE_RESOURCE() method of the parent of @p dev. 3212 */ 3213int 3214bus_generic_deactivate_resource(device_t dev, device_t child, int type, 3215 int rid, struct resource *r) 3216{ 3217 /* Propagate up the bus hierarchy until someone handles it. */ 3218 if (dev->parent) 3219 return (BUS_DEACTIVATE_RESOURCE(dev->parent, child, type, rid, 3220 r)); 3221 return (EINVAL); 3222} 3223 3224/** 3225 * @brief Helper function for implementing BUS_BIND_INTR(). 3226 * 3227 * This simple implementation of BUS_BIND_INTR() simply calls the 3228 * BUS_BIND_INTR() method of the parent of @p dev. 3229 */ 3230int 3231bus_generic_bind_intr(device_t dev, device_t child, struct resource *irq, 3232 int cpu) 3233{ 3234 3235 /* Propagate up the bus hierarchy until someone handles it. */ 3236 if (dev->parent) 3237 return (BUS_BIND_INTR(dev->parent, child, irq, cpu)); 3238 return (EINVAL); 3239} 3240 3241/** 3242 * @brief Helper function for implementing BUS_CONFIG_INTR(). 3243 * 3244 * This simple implementation of BUS_CONFIG_INTR() simply calls the 3245 * BUS_CONFIG_INTR() method of the parent of @p dev. 3246 */ 3247int 3248bus_generic_config_intr(device_t dev, int irq, enum intr_trigger trig, 3249 enum intr_polarity pol) 3250{ 3251 3252 /* Propagate up the bus hierarchy until someone handles it. */ 3253 if (dev->parent) 3254 return (BUS_CONFIG_INTR(dev->parent, irq, trig, pol)); 3255 return (EINVAL); 3256} 3257 3258/** 3259 * @brief Helper function for implementing BUS_GET_DMA_TAG(). 3260 * 3261 * This simple implementation of BUS_GET_DMA_TAG() simply calls the 3262 * BUS_GET_DMA_TAG() method of the parent of @p dev. 3263 */ 3264bus_dma_tag_t 3265bus_generic_get_dma_tag(device_t dev, device_t child) 3266{ 3267 3268 /* Propagate up the bus hierarchy until someone handles it. */ 3269 if (dev->parent != NULL) 3270 return (BUS_GET_DMA_TAG(dev->parent, child)); 3271 return (NULL); 3272} 3273 3274/** 3275 * @brief Helper function for implementing BUS_GET_RESOURCE(). 3276 * 3277 * This implementation of BUS_GET_RESOURCE() uses the 3278 * resource_list_find() function to do most of the work. It calls 3279 * BUS_GET_RESOURCE_LIST() to find a suitable resource list to 3280 * search. 3281 */ 3282int 3283bus_generic_rl_get_resource(device_t dev, device_t child, int type, int rid, 3284 u_long *startp, u_long *countp) 3285{ 3286 struct resource_list * rl = NULL; 3287 struct resource_list_entry * rle = NULL; 3288 3289 rl = BUS_GET_RESOURCE_LIST(dev, child); 3290 if (!rl) 3291 return (EINVAL); 3292 3293 rle = resource_list_find(rl, type, rid); 3294 if (!rle) 3295 return (ENOENT); 3296 3297 if (startp) 3298 *startp = rle->start; 3299 if (countp) 3300 *countp = rle->count; 3301 3302 return (0); 3303} 3304 3305/** 3306 * @brief Helper function for implementing BUS_SET_RESOURCE(). 3307 * 3308 * This implementation of BUS_SET_RESOURCE() uses the 3309 * resource_list_add() function to do most of the work. It calls 3310 * BUS_GET_RESOURCE_LIST() to find a suitable resource list to 3311 * edit. 3312 */ 3313int 3314bus_generic_rl_set_resource(device_t dev, device_t child, int type, int rid, 3315 u_long start, u_long count) 3316{ 3317 struct resource_list * rl = NULL; 3318 3319 rl = BUS_GET_RESOURCE_LIST(dev, child); 3320 if (!rl) 3321 return (EINVAL); 3322 3323 resource_list_add(rl, type, rid, start, (start + count - 1), count); 3324 3325 return (0); 3326} 3327 3328/** 3329 * @brief Helper function for implementing BUS_DELETE_RESOURCE(). 3330 * 3331 * This implementation of BUS_DELETE_RESOURCE() uses the 3332 * resource_list_delete() function to do most of the work. It calls 3333 * BUS_GET_RESOURCE_LIST() to find a suitable resource list to 3334 * edit. 3335 */ 3336void 3337bus_generic_rl_delete_resource(device_t dev, device_t child, int type, int rid) 3338{ 3339 struct resource_list * rl = NULL; 3340 3341 rl = BUS_GET_RESOURCE_LIST(dev, child); 3342 if (!rl) 3343 return; 3344 3345 resource_list_delete(rl, type, rid); 3346 3347 return; 3348} 3349 3350/** 3351 * @brief Helper function for implementing BUS_RELEASE_RESOURCE(). 3352 * 3353 * This implementation of BUS_RELEASE_RESOURCE() uses the 3354 * resource_list_release() function to do most of the work. It calls 3355 * BUS_GET_RESOURCE_LIST() to find a suitable resource list. 3356 */ 3357int 3358bus_generic_rl_release_resource(device_t dev, device_t child, int type, 3359 int rid, struct resource *r) 3360{ 3361 struct resource_list * rl = NULL; 3362 3363 rl = BUS_GET_RESOURCE_LIST(dev, child); 3364 if (!rl) 3365 return (EINVAL); 3366 3367 return (resource_list_release(rl, dev, child, type, rid, r)); 3368} 3369 3370/** 3371 * @brief Helper function for implementing BUS_ALLOC_RESOURCE(). 3372 * 3373 * This implementation of BUS_ALLOC_RESOURCE() uses the 3374 * resource_list_alloc() function to do most of the work. It calls 3375 * BUS_GET_RESOURCE_LIST() to find a suitable resource list. 3376 */ 3377struct resource * 3378bus_generic_rl_alloc_resource(device_t dev, device_t child, int type, 3379 int *rid, u_long start, u_long end, u_long count, u_int flags) 3380{ 3381 struct resource_list * rl = NULL; 3382 3383 rl = BUS_GET_RESOURCE_LIST(dev, child); 3384 if (!rl) 3385 return (NULL); 3386 3387 return (resource_list_alloc(rl, dev, child, type, rid, 3388 start, end, count, flags)); 3389} 3390 3391/** 3392 * @brief Helper function for implementing BUS_CHILD_PRESENT(). 3393 * 3394 * This simple implementation of BUS_CHILD_PRESENT() simply calls the 3395 * BUS_CHILD_PRESENT() method of the parent of @p dev. 3396 */ 3397int 3398bus_generic_child_present(device_t dev, device_t child) 3399{ 3400 return (BUS_CHILD_PRESENT(device_get_parent(dev), dev)); 3401} 3402 3403/* 3404 * Some convenience functions to make it easier for drivers to use the 3405 * resource-management functions. All these really do is hide the 3406 * indirection through the parent's method table, making for slightly 3407 * less-wordy code. In the future, it might make sense for this code 3408 * to maintain some sort of a list of resources allocated by each device. 3409 */ 3410 3411int 3412bus_alloc_resources(device_t dev, struct resource_spec *rs, 3413 struct resource **res) 3414{ 3415 int i; 3416 3417 for (i = 0; rs[i].type != -1; i++) 3418 res[i] = NULL; 3419 for (i = 0; rs[i].type != -1; i++) { 3420 res[i] = bus_alloc_resource_any(dev, 3421 rs[i].type, &rs[i].rid, rs[i].flags); 3422 if (res[i] == NULL && !(rs[i].flags & RF_OPTIONAL)) { 3423 bus_release_resources(dev, rs, res); 3424 return (ENXIO); 3425 } 3426 } 3427 return (0); 3428} 3429 3430void 3431bus_release_resources(device_t dev, const struct resource_spec *rs, 3432 struct resource **res) 3433{ 3434 int i; 3435 3436 for (i = 0; rs[i].type != -1; i++) 3437 if (res[i] != NULL) { 3438 bus_release_resource( 3439 dev, rs[i].type, rs[i].rid, res[i]); 3440 res[i] = NULL; 3441 } 3442} 3443 3444/** 3445 * @brief Wrapper function for BUS_ALLOC_RESOURCE(). 3446 * 3447 * This function simply calls the BUS_ALLOC_RESOURCE() method of the 3448 * parent of @p dev. 3449 */ 3450struct resource * 3451bus_alloc_resource(device_t dev, int type, int *rid, u_long start, u_long end, 3452 u_long count, u_int flags) 3453{ 3454 if (dev->parent == NULL) 3455 return (NULL); 3456 return (BUS_ALLOC_RESOURCE(dev->parent, dev, type, rid, start, end, 3457 count, flags)); 3458} 3459 3460/** 3461 * @brief Wrapper function for BUS_ACTIVATE_RESOURCE(). 3462 * 3463 * This function simply calls the BUS_ACTIVATE_RESOURCE() method of the 3464 * parent of @p dev. 3465 */ 3466int 3467bus_activate_resource(device_t dev, int type, int rid, struct resource *r) 3468{ 3469 if (dev->parent == NULL) 3470 return (EINVAL); 3471 return (BUS_ACTIVATE_RESOURCE(dev->parent, dev, type, rid, r)); 3472} 3473 3474/** 3475 * @brief Wrapper function for BUS_DEACTIVATE_RESOURCE(). 3476 * 3477 * This function simply calls the BUS_DEACTIVATE_RESOURCE() method of the 3478 * parent of @p dev. 3479 */ 3480int 3481bus_deactivate_resource(device_t dev, int type, int rid, struct resource *r) 3482{ 3483 if (dev->parent == NULL) 3484 return (EINVAL); 3485 return (BUS_DEACTIVATE_RESOURCE(dev->parent, dev, type, rid, r)); 3486} 3487 3488/** 3489 * @brief Wrapper function for BUS_RELEASE_RESOURCE(). 3490 * 3491 * This function simply calls the BUS_RELEASE_RESOURCE() method of the 3492 * parent of @p dev. 3493 */ 3494int 3495bus_release_resource(device_t dev, int type, int rid, struct resource *r) 3496{ 3497 if (dev->parent == NULL) 3498 return (EINVAL); 3499 return (BUS_RELEASE_RESOURCE(dev->parent, dev, type, rid, r)); 3500} 3501 3502/** 3503 * @brief Wrapper function for BUS_SETUP_INTR(). 3504 * 3505 * This function simply calls the BUS_SETUP_INTR() method of the 3506 * parent of @p dev. 3507 */ 3508int 3509bus_setup_intr(device_t dev, struct resource *r, int flags, 3510 driver_filter_t filter, driver_intr_t handler, void *arg, void **cookiep) 3511{ 3512 int error; 3513 3514 if (dev->parent == NULL) 3515 return (EINVAL); 3516 error = BUS_SETUP_INTR(dev->parent, dev, r, flags, filter, handler, 3517 arg, cookiep); 3518 if (error != 0) 3519 return (error); 3520 if (handler != NULL && !(flags & INTR_MPSAFE)) 3521 device_printf(dev, "[GIANT-LOCKED]\n"); 3522 if (bootverbose && (flags & INTR_MPSAFE)) 3523 device_printf(dev, "[MPSAFE]\n"); 3524 if (filter != NULL) { 3525 if (handler == NULL) 3526 device_printf(dev, "[FILTER]\n"); 3527 else 3528 device_printf(dev, "[FILTER+ITHREAD]\n"); 3529 } else 3530 device_printf(dev, "[ITHREAD]\n"); 3531 return (0); 3532} 3533 3534/** 3535 * @brief Wrapper function for BUS_TEARDOWN_INTR(). 3536 * 3537 * This function simply calls the BUS_TEARDOWN_INTR() method of the 3538 * parent of @p dev. 3539 */ 3540int 3541bus_teardown_intr(device_t dev, struct resource *r, void *cookie) 3542{ 3543 if (dev->parent == NULL) 3544 return (EINVAL); 3545 return (BUS_TEARDOWN_INTR(dev->parent, dev, r, cookie)); 3546} 3547 3548/** 3549 * @brief Wrapper function for BUS_BIND_INTR(). 3550 * 3551 * This function simply calls the BUS_BIND_INTR() method of the 3552 * parent of @p dev. 3553 */ 3554int 3555bus_bind_intr(device_t dev, struct resource *r, int cpu) 3556{ 3557 if (dev->parent == NULL) 3558 return (EINVAL); 3559 return (BUS_BIND_INTR(dev->parent, dev, r, cpu)); 3560} 3561 3562/** 3563 * @brief Wrapper function for BUS_SET_RESOURCE(). 3564 * 3565 * This function simply calls the BUS_SET_RESOURCE() method of the 3566 * parent of @p dev. 3567 */ 3568int 3569bus_set_resource(device_t dev, int type, int rid, 3570 u_long start, u_long count) 3571{ 3572 return (BUS_SET_RESOURCE(device_get_parent(dev), dev, type, rid, 3573 start, count)); 3574} 3575 3576/** 3577 * @brief Wrapper function for BUS_GET_RESOURCE(). 3578 * 3579 * This function simply calls the BUS_GET_RESOURCE() method of the 3580 * parent of @p dev. 3581 */ 3582int 3583bus_get_resource(device_t dev, int type, int rid, 3584 u_long *startp, u_long *countp) 3585{ 3586 return (BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid, 3587 startp, countp)); 3588} 3589 3590/** 3591 * @brief Wrapper function for BUS_GET_RESOURCE(). 3592 * 3593 * This function simply calls the BUS_GET_RESOURCE() method of the 3594 * parent of @p dev and returns the start value. 3595 */ 3596u_long 3597bus_get_resource_start(device_t dev, int type, int rid) 3598{ 3599 u_long start, count; 3600 int error; 3601 3602 error = BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid, 3603 &start, &count); 3604 if (error) 3605 return (0); 3606 return (start); 3607} 3608 3609/** 3610 * @brief Wrapper function for BUS_GET_RESOURCE(). 3611 * 3612 * This function simply calls the BUS_GET_RESOURCE() method of the 3613 * parent of @p dev and returns the count value. 3614 */ 3615u_long 3616bus_get_resource_count(device_t dev, int type, int rid) 3617{ 3618 u_long start, count; 3619 int error; 3620 3621 error = BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid, 3622 &start, &count); 3623 if (error) 3624 return (0); 3625 return (count); 3626} 3627 3628/** 3629 * @brief Wrapper function for BUS_DELETE_RESOURCE(). 3630 * 3631 * This function simply calls the BUS_DELETE_RESOURCE() method of the 3632 * parent of @p dev. 3633 */ 3634void 3635bus_delete_resource(device_t dev, int type, int rid) 3636{ 3637 BUS_DELETE_RESOURCE(device_get_parent(dev), dev, type, rid); 3638} 3639 3640/** 3641 * @brief Wrapper function for BUS_CHILD_PRESENT(). 3642 * 3643 * This function simply calls the BUS_CHILD_PRESENT() method of the 3644 * parent of @p dev. 3645 */ 3646int 3647bus_child_present(device_t child) 3648{ 3649 return (BUS_CHILD_PRESENT(device_get_parent(child), child)); 3650} 3651 3652/** 3653 * @brief Wrapper function for BUS_CHILD_PNPINFO_STR(). 3654 * 3655 * This function simply calls the BUS_CHILD_PNPINFO_STR() method of the 3656 * parent of @p dev. 3657 */ 3658int 3659bus_child_pnpinfo_str(device_t child, char *buf, size_t buflen) 3660{ 3661 device_t parent; 3662 3663 parent = device_get_parent(child); 3664 if (parent == NULL) { 3665 *buf = '\0'; 3666 return (0); 3667 } 3668 return (BUS_CHILD_PNPINFO_STR(parent, child, buf, buflen)); 3669} 3670 3671/** 3672 * @brief Wrapper function for BUS_CHILD_LOCATION_STR(). 3673 * 3674 * This function simply calls the BUS_CHILD_LOCATION_STR() method of the 3675 * parent of @p dev. 3676 */ 3677int 3678bus_child_location_str(device_t child, char *buf, size_t buflen) 3679{ 3680 device_t parent; 3681 3682 parent = device_get_parent(child); 3683 if (parent == NULL) { 3684 *buf = '\0'; 3685 return (0); 3686 } 3687 return (BUS_CHILD_LOCATION_STR(parent, child, buf, buflen)); 3688} 3689 3690/** 3691 * @brief Wrapper function for BUS_GET_DMA_TAG(). 3692 * 3693 * This function simply calls the BUS_GET_DMA_TAG() method of the 3694 * parent of @p dev. 3695 */ 3696bus_dma_tag_t 3697bus_get_dma_tag(device_t dev) 3698{ 3699 device_t parent; 3700 3701 parent = device_get_parent(dev); 3702 if (parent == NULL) 3703 return (NULL); 3704 return (BUS_GET_DMA_TAG(parent, dev)); 3705} 3706 3707/* Resume all devices and then notify userland that we're up again. */ 3708static int 3709root_resume(device_t dev) 3710{ 3711 int error; 3712 3713 error = bus_generic_resume(dev); 3714 if (error == 0) 3715 devctl_notify("kern", "power", "resume", NULL); 3716 return (error); 3717} 3718 3719static int 3720root_print_child(device_t dev, device_t child) 3721{ 3722 int retval = 0; 3723 3724 retval += bus_print_child_header(dev, child); 3725 retval += printf("\n"); 3726 3727 return (retval); 3728} 3729 3730static int 3731root_setup_intr(device_t dev, device_t child, driver_intr_t *intr, void *arg, 3732 void **cookiep) 3733{ 3734 /* 3735 * If an interrupt mapping gets to here something bad has happened. 3736 */ 3737 panic("root_setup_intr"); 3738} 3739 3740/* 3741 * If we get here, assume that the device is permanant and really is 3742 * present in the system. Removable bus drivers are expected to intercept 3743 * this call long before it gets here. We return -1 so that drivers that 3744 * really care can check vs -1 or some ERRNO returned higher in the food 3745 * chain. 3746 */ 3747static int 3748root_child_present(device_t dev, device_t child) 3749{ 3750 return (-1); 3751} 3752 3753static kobj_method_t root_methods[] = { 3754 /* Device interface */ 3755 KOBJMETHOD(device_shutdown, bus_generic_shutdown), 3756 KOBJMETHOD(device_suspend, bus_generic_suspend), 3757 KOBJMETHOD(device_resume, root_resume), 3758 3759 /* Bus interface */ 3760 KOBJMETHOD(bus_print_child, root_print_child), 3761 KOBJMETHOD(bus_read_ivar, bus_generic_read_ivar), 3762 KOBJMETHOD(bus_write_ivar, bus_generic_write_ivar), 3763 KOBJMETHOD(bus_setup_intr, root_setup_intr), 3764 KOBJMETHOD(bus_child_present, root_child_present), 3765 3766 { 0, 0 } 3767}; 3768 3769static driver_t root_driver = { 3770 "root", 3771 root_methods, 3772 1, /* no softc */ 3773}; 3774 3775device_t root_bus; 3776devclass_t root_devclass; 3777 3778static int 3779root_bus_module_handler(module_t mod, int what, void* arg) 3780{ 3781 switch (what) { 3782 case MOD_LOAD: 3783 TAILQ_INIT(&bus_data_devices); 3784 kobj_class_compile((kobj_class_t) &root_driver); 3785 root_bus = make_device(NULL, "root", 0); 3786 root_bus->desc = "System root bus"; 3787 kobj_init((kobj_t) root_bus, (kobj_class_t) &root_driver); 3788 root_bus->driver = &root_driver; 3789 root_bus->state = DS_ATTACHED; 3790 root_devclass = devclass_find_internal("root", NULL, FALSE); 3791 devinit(); 3792 return (0); 3793 3794 case MOD_SHUTDOWN: 3795 device_shutdown(root_bus); 3796 return (0); 3797 default: 3798 return (EOPNOTSUPP); 3799 } 3800 3801 return (0); 3802} 3803 3804static moduledata_t root_bus_mod = { 3805 "rootbus", 3806 root_bus_module_handler, 3807 0 3808}; 3809DECLARE_MODULE(rootbus, root_bus_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 3810 3811/** 3812 * @brief Automatically configure devices 3813 * 3814 * This function begins the autoconfiguration process by calling 3815 * device_probe_and_attach() for each child of the @c root0 device. 3816 */ 3817void 3818root_bus_configure(void) 3819{ 3820 device_t dev; 3821 3822 PDEBUG((".")); 3823 3824 TAILQ_FOREACH(dev, &root_bus->children, link) { 3825 device_probe_and_attach(dev); 3826 } 3827} 3828 3829/** 3830 * @brief Module handler for registering device drivers 3831 * 3832 * This module handler is used to automatically register device 3833 * drivers when modules are loaded. If @p what is MOD_LOAD, it calls 3834 * devclass_add_driver() for the driver described by the 3835 * driver_module_data structure pointed to by @p arg 3836 */ 3837int 3838driver_module_handler(module_t mod, int what, void *arg) 3839{ 3840 int error; 3841 struct driver_module_data *dmd; 3842 devclass_t bus_devclass; 3843 kobj_class_t driver; 3844 3845 dmd = (struct driver_module_data *)arg; 3846 bus_devclass = devclass_find_internal(dmd->dmd_busname, NULL, TRUE); 3847 error = 0; 3848 3849 switch (what) { 3850 case MOD_LOAD: 3851 if (dmd->dmd_chainevh) 3852 error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg); 3853 3854 driver = dmd->dmd_driver; 3855 PDEBUG(("Loading module: driver %s on bus %s", 3856 DRIVERNAME(driver), dmd->dmd_busname)); 3857 error = devclass_add_driver(bus_devclass, driver); 3858 if (error) 3859 break; 3860 3861 /* 3862 * If the driver has any base classes, make the 3863 * devclass inherit from the devclass of the driver's 3864 * first base class. This will allow the system to 3865 * search for drivers in both devclasses for children 3866 * of a device using this driver. 3867 */ 3868 if (driver->baseclasses) { 3869 const char *parentname; 3870 parentname = driver->baseclasses[0]->name; 3871 *dmd->dmd_devclass = 3872 devclass_find_internal(driver->name, 3873 parentname, TRUE); 3874 } else { 3875 *dmd->dmd_devclass = 3876 devclass_find_internal(driver->name, NULL, TRUE); 3877 } 3878 break; 3879 3880 case MOD_UNLOAD: 3881 PDEBUG(("Unloading module: driver %s from bus %s", 3882 DRIVERNAME(dmd->dmd_driver), 3883 dmd->dmd_busname)); 3884 error = devclass_delete_driver(bus_devclass, 3885 dmd->dmd_driver); 3886 3887 if (!error && dmd->dmd_chainevh) 3888 error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg); 3889 break; 3890 case MOD_QUIESCE: 3891 PDEBUG(("Quiesce module: driver %s from bus %s", 3892 DRIVERNAME(dmd->dmd_driver), 3893 dmd->dmd_busname)); 3894 error = devclass_quiesce_driver(bus_devclass, 3895 dmd->dmd_driver); 3896 3897 if (!error && dmd->dmd_chainevh) 3898 error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg); 3899 break; 3900 default: 3901 error = EOPNOTSUPP; 3902 break; 3903 } 3904 3905 return (error); 3906} 3907 3908/** 3909 * @brief Enumerate all hinted devices for this bus. 3910 * 3911 * Walks through the hints for this bus and calls the bus_hinted_child 3912 * routine for each one it fines. It searches first for the specific 3913 * bus that's being probed for hinted children (eg isa0), and then for 3914 * generic children (eg isa). 3915 * 3916 * @param dev bus device to enumerate 3917 */ 3918void 3919bus_enumerate_hinted_children(device_t bus) 3920{ 3921 int i; 3922 const char *dname, *busname; 3923 int dunit; 3924 3925 /* 3926 * enumerate all devices on the specific bus 3927 */ 3928 busname = device_get_nameunit(bus); 3929 i = 0; 3930 while (resource_find_match(&i, &dname, &dunit, "at", busname) == 0) 3931 BUS_HINTED_CHILD(bus, dname, dunit); 3932 3933 /* 3934 * and all the generic ones. 3935 */ 3936 busname = device_get_name(bus); 3937 i = 0; 3938 while (resource_find_match(&i, &dname, &dunit, "at", busname) == 0) 3939 BUS_HINTED_CHILD(bus, dname, dunit); 3940} 3941 3942#ifdef BUS_DEBUG 3943 3944/* the _short versions avoid iteration by not calling anything that prints 3945 * more than oneliners. I love oneliners. 3946 */ 3947 3948static void 3949print_device_short(device_t dev, int indent) 3950{ 3951 if (!dev) 3952 return; 3953 3954 indentprintf(("device %d: <%s> %sparent,%schildren,%s%s%s%s%s,%sivars,%ssoftc,busy=%d\n", 3955 dev->unit, dev->desc, 3956 (dev->parent? "":"no "), 3957 (TAILQ_EMPTY(&dev->children)? "no ":""), 3958 (dev->flags&DF_ENABLED? "enabled,":"disabled,"), 3959 (dev->flags&DF_FIXEDCLASS? "fixed,":""), 3960 (dev->flags&DF_WILDCARD? "wildcard,":""), 3961 (dev->flags&DF_DESCMALLOCED? "descmalloced,":""), 3962 (dev->flags&DF_REBID? "rebiddable,":""), 3963 (dev->ivars? "":"no "), 3964 (dev->softc? "":"no "), 3965 dev->busy)); 3966} 3967 3968static void 3969print_device(device_t dev, int indent) 3970{ 3971 if (!dev) 3972 return; 3973 3974 print_device_short(dev, indent); 3975 3976 indentprintf(("Parent:\n")); 3977 print_device_short(dev->parent, indent+1); 3978 indentprintf(("Driver:\n")); 3979 print_driver_short(dev->driver, indent+1); 3980 indentprintf(("Devclass:\n")); 3981 print_devclass_short(dev->devclass, indent+1); 3982} 3983 3984void 3985print_device_tree_short(device_t dev, int indent) 3986/* print the device and all its children (indented) */ 3987{ 3988 device_t child; 3989 3990 if (!dev) 3991 return; 3992 3993 print_device_short(dev, indent); 3994 3995 TAILQ_FOREACH(child, &dev->children, link) { 3996 print_device_tree_short(child, indent+1); 3997 } 3998} 3999 4000void 4001print_device_tree(device_t dev, int indent) 4002/* print the device and all its children (indented) */ 4003{ 4004 device_t child; 4005 4006 if (!dev) 4007 return; 4008 4009 print_device(dev, indent); 4010 4011 TAILQ_FOREACH(child, &dev->children, link) { 4012 print_device_tree(child, indent+1); 4013 } 4014} 4015 4016static void 4017print_driver_short(driver_t *driver, int indent) 4018{ 4019 if (!driver) 4020 return; 4021 4022 indentprintf(("driver %s: softc size = %zd\n", 4023 driver->name, driver->size)); 4024} 4025 4026static void 4027print_driver(driver_t *driver, int indent) 4028{ 4029 if (!driver) 4030 return; 4031 4032 print_driver_short(driver, indent); 4033} 4034 4035 4036static void 4037print_driver_list(driver_list_t drivers, int indent) 4038{ 4039 driverlink_t driver; 4040 4041 TAILQ_FOREACH(driver, &drivers, link) { 4042 print_driver(driver->driver, indent); 4043 } 4044} 4045 4046static void 4047print_devclass_short(devclass_t dc, int indent) 4048{ 4049 if ( !dc ) 4050 return; 4051 4052 indentprintf(("devclass %s: max units = %d\n", dc->name, dc->maxunit)); 4053} 4054 4055static void 4056print_devclass(devclass_t dc, int indent) 4057{ 4058 int i; 4059 4060 if ( !dc ) 4061 return; 4062 4063 print_devclass_short(dc, indent); 4064 indentprintf(("Drivers:\n")); 4065 print_driver_list(dc->drivers, indent+1); 4066 4067 indentprintf(("Devices:\n")); 4068 for (i = 0; i < dc->maxunit; i++) 4069 if (dc->devices[i]) 4070 print_device(dc->devices[i], indent+1); 4071} 4072 4073void 4074print_devclass_list_short(void) 4075{ 4076 devclass_t dc; 4077 4078 printf("Short listing of devclasses, drivers & devices:\n"); 4079 TAILQ_FOREACH(dc, &devclasses, link) { 4080 print_devclass_short(dc, 0); 4081 } 4082} 4083 4084void 4085print_devclass_list(void) 4086{ 4087 devclass_t dc; 4088 4089 printf("Full listing of devclasses, drivers & devices:\n"); 4090 TAILQ_FOREACH(dc, &devclasses, link) { 4091 print_devclass(dc, 0); 4092 } 4093} 4094 4095#endif 4096 4097/* 4098 * User-space access to the device tree. 4099 * 4100 * We implement a small set of nodes: 4101 * 4102 * hw.bus Single integer read method to obtain the 4103 * current generation count. 4104 * hw.bus.devices Reads the entire device tree in flat space. 4105 * hw.bus.rman Resource manager interface 4106 * 4107 * We might like to add the ability to scan devclasses and/or drivers to 4108 * determine what else is currently loaded/available. 4109 */ 4110 4111static int 4112sysctl_bus(SYSCTL_HANDLER_ARGS) 4113{ 4114 struct u_businfo ubus; 4115 4116 ubus.ub_version = BUS_USER_VERSION; 4117 ubus.ub_generation = bus_data_generation; 4118 4119 return (SYSCTL_OUT(req, &ubus, sizeof(ubus))); 4120} 4121SYSCTL_NODE(_hw_bus, OID_AUTO, info, CTLFLAG_RW, sysctl_bus, 4122 "bus-related data"); 4123 4124static int 4125sysctl_devices(SYSCTL_HANDLER_ARGS) 4126{ 4127 int *name = (int *)arg1; 4128 u_int namelen = arg2; 4129 int index; 4130 struct device *dev; 4131 struct u_device udev; /* XXX this is a bit big */ 4132 int error; 4133 4134 if (namelen != 2) 4135 return (EINVAL); 4136 4137 if (bus_data_generation_check(name[0])) 4138 return (EINVAL); 4139 4140 index = name[1]; 4141 4142 /* 4143 * Scan the list of devices, looking for the requested index. 4144 */ 4145 TAILQ_FOREACH(dev, &bus_data_devices, devlink) { 4146 if (index-- == 0) 4147 break; 4148 } 4149 if (dev == NULL) 4150 return (ENOENT); 4151 4152 /* 4153 * Populate the return array. 4154 */ 4155 bzero(&udev, sizeof(udev)); 4156 udev.dv_handle = (uintptr_t)dev; 4157 udev.dv_parent = (uintptr_t)dev->parent; 4158 if (dev->nameunit != NULL) 4159 strlcpy(udev.dv_name, dev->nameunit, sizeof(udev.dv_name)); 4160 if (dev->desc != NULL) 4161 strlcpy(udev.dv_desc, dev->desc, sizeof(udev.dv_desc)); 4162 if (dev->driver != NULL && dev->driver->name != NULL) 4163 strlcpy(udev.dv_drivername, dev->driver->name, 4164 sizeof(udev.dv_drivername)); 4165 bus_child_pnpinfo_str(dev, udev.dv_pnpinfo, sizeof(udev.dv_pnpinfo)); 4166 bus_child_location_str(dev, udev.dv_location, sizeof(udev.dv_location)); 4167 udev.dv_devflags = dev->devflags; 4168 udev.dv_flags = dev->flags; 4169 udev.dv_state = dev->state; 4170 error = SYSCTL_OUT(req, &udev, sizeof(udev)); 4171 return (error); 4172} 4173 4174SYSCTL_NODE(_hw_bus, OID_AUTO, devices, CTLFLAG_RD, sysctl_devices, 4175 "system device tree"); 4176 4177int 4178bus_data_generation_check(int generation) 4179{ 4180 if (generation != bus_data_generation) 4181 return (1); 4182 4183 /* XXX generate optimised lists here? */ 4184 return (0); 4185} 4186 4187void 4188bus_data_generation_update(void) 4189{ 4190 bus_data_generation++; 4191} 4192 4193int 4194bus_free_resource(device_t dev, int type, struct resource *r) 4195{ 4196 if (r == NULL) 4197 return (0); 4198 return (bus_release_resource(dev, type, rman_get_rid(r), r)); 4199} 4200