sys/kern/subr_bus.c

   1 /*
   2  * Copyright (c) 1997,1998 Doug Rabson
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/kern/subr_bus.c,v 1.54.2.9 2002/10/10 15:13:32 jhb Exp $
  27  * $DragonFly: src/sys/kern/subr_bus.c,v 1.46 2008/10/03 00:26:21 hasso Exp $
  28  */
  29
  30 #include "opt_bus.h"
  31
  32 #include <sys/param.h>
  33 #include <sys/queue.h>
  34 #include <sys/malloc.h>
  35 #include <sys/kernel.h>
  36 #include <sys/module.h>
  37 #include <sys/kobj.h>
  38 #include <sys/bus_private.h>
  39 #include <sys/sysctl.h>
  40 #include <sys/systm.h>
  41 #include <sys/bus.h>
  42 #include <sys/rman.h>
  43 #include <sys/device.h>
  44 #include <sys/lock.h>
  45 #include <sys/conf.h>
  46 #include <sys/uio.h>
  47 #include <sys/filio.h>
  48 #include <sys/event.h>
  49 #include <sys/signalvar.h>
  50
  51 #include <machine/stdarg.h>     /* for device_printf() */
  52
  53 #include <sys/thread2.h>
  54 #include <sys/mplock2.h>
  55
  56 SYSCTL_NODE(_hw, OID_AUTO, bus, CTLFLAG_RW, NULL, NULL);
  57
  58 MALLOC_DEFINE(M_BUS, "bus", "Bus data structures");
  59
  60 #ifdef BUS_DEBUG
  61 #define PDEBUG(a)       (kprintf("%s:%d: ", __func__, __LINE__), kprintf a, kprintf("\n"))
  62 #define DEVICENAME(d)   ((d)? device_get_name(d): "no device")
  63 #define DRIVERNAME(d)   ((d)? d->name : "no driver")
  64 #define DEVCLANAME(d)   ((d)? d->name : "no devclass")
  65
  66 /* Produce the indenting, indent*2 spaces plus a '.' ahead of that to
  67  * prevent syslog from deleting initial spaces
  68  */
  69 #define indentprintf(p) do { int iJ; kprintf("."); for (iJ=0; iJ<indent; iJ++) kprintf("  "); kprintf p ; } while(0)
  70
  71 static void     print_device_short(device_t dev, int indent);
  72 static void     print_device(device_t dev, int indent);
  73 void            print_device_tree_short(device_t dev, int indent);
  74 void            print_device_tree(device_t dev, int indent);
  75 static void     print_driver_short(driver_t *driver, int indent);
  76 static void     print_driver(driver_t *driver, int indent);
  77 static void     print_driver_list(driver_list_t drivers, int indent);
  78 static void     print_devclass_short(devclass_t dc, int indent);
  79 static void     print_devclass(devclass_t dc, int indent);
  80 void            print_devclass_list_short(void);
  81 void            print_devclass_list(void);
  82
  83 #else
  84 /* Make the compiler ignore the function calls */
  85 #define PDEBUG(a)                       /* nop */
  86 #define DEVICENAME(d)                   /* nop */
  87 #define DRIVERNAME(d)                   /* nop */
  88 #define DEVCLANAME(d)                   /* nop */
  89
  90 #define print_device_short(d,i)         /* nop */
  91 #define print_device(d,i)               /* nop */
  92 #define print_device_tree_short(d,i)    /* nop */
  93 #define print_device_tree(d,i)          /* nop */
  94 #define print_driver_short(d,i)         /* nop */
  95 #define print_driver(d,i)               /* nop */
  96 #define print_driver_list(d,i)          /* nop */
  97 #define print_devclass_short(d,i)       /* nop */
  98 #define print_devclass(d,i)             /* nop */
  99 #define print_devclass_list_short()     /* nop */
 100 #define print_devclass_list()           /* nop */
 101 #endif
 102
 103 static void     device_attach_async(device_t dev);
 104 static void     device_attach_thread(void *arg);
 105 static int      device_doattach(device_t dev);
 106
 107 static int do_async_attach = 0;
 108 static int numasyncthreads;
 109 TUNABLE_INT("kern.do_async_attach", &do_async_attach);
 110
 111 /*
 112  * /dev/devctl implementation
 113  */
 114
 115 /*
 116  * This design allows only one reader for /dev/devctl.  This is not desirable
 117  * in the long run, but will get a lot of hair out of this implementation.
 118  * Maybe we should make this device a clonable device.
 119  *
 120  * Also note: we specifically do not attach a device to the device_t tree
 121  * to avoid potential chicken and egg problems.  One could argue that all
 122  * of this belongs to the root node.  One could also further argue that the
 123  * sysctl interface that we have not might more properly be an ioctl
 124  * interface, but at this stage of the game, I'm not inclined to rock that
 125  * boat.
 126  *
 127  * I'm also not sure that the SIGIO support is done correctly or not, as
 128  * I copied it from a driver that had SIGIO support that likely hasn't been
 129  * tested since 3.4 or 2.2.8!
 130  */
 131
 132 static int sysctl_devctl_disable(SYSCTL_HANDLER_ARGS);
 133 static int devctl_disable = 0;
 134 TUNABLE_INT("hw.bus.devctl_disable", &devctl_disable);
 135 SYSCTL_PROC(_hw_bus, OID_AUTO, devctl_disable, CTLTYPE_INT | CTLFLAG_RW, 0, 0,
 136     sysctl_devctl_disable, "I", "devctl disable");
 137
 138 #define CDEV_MAJOR      188
 139
 140 static d_open_t         devopen;
 141 static d_close_t        devclose;
 142 static d_read_t         devread;
 143 static d_ioctl_t        devioctl;
 144 static d_kqfilter_t     devkqfilter;
 145
 146 static struct dev_ops devctl_ops = {
 147         { "devctl", CDEV_MAJOR, 0 },
 148         .d_open =       devopen,
 149         .d_close =      devclose,
 150         .d_read =       devread,
 151         .d_ioctl =      devioctl,
 152         .d_kqfilter =   devkqfilter
 153 };
 154
 155 struct dev_event_info
 156 {
 157         char *dei_data;
 158         TAILQ_ENTRY(dev_event_info) dei_link;
 159 };
 160
 161 TAILQ_HEAD(devq, dev_event_info);
 162
 163 static struct dev_softc
 164 {
 165         int     inuse;
 166         int     nonblock;
 167         struct lock lock;
 168         struct kqinfo kq;
 169         struct devq devq;
 170         struct proc *async_proc;
 171 } devsoftc;
 172
 173 static void
 174 devinit(void)
 175 {
 176         make_dev(&devctl_ops, 0, UID_ROOT, GID_WHEEL, 0600, "devctl");
 177         lockinit(&devsoftc.lock, "dev mtx", 0, 0);
 178         TAILQ_INIT(&devsoftc.devq);
 179 }
 180
 181 static int
 182 devopen(struct dev_open_args *ap)
 183 {
 184         if (devsoftc.inuse)
 185                 return (EBUSY);
 186         /* move to init */
 187         devsoftc.inuse = 1;
 188         devsoftc.nonblock = 0;
 189         devsoftc.async_proc = NULL;
 190         return (0);
 191 }
 192
 193 static int
 194 devclose(struct dev_close_args *ap)
 195 {
 196         devsoftc.inuse = 0;
 197         lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 198         wakeup(&devsoftc);
 199         lockmgr(&devsoftc.lock, LK_RELEASE);
 200
 201         return (0);
 202 }
 203
 204 /*
 205  * The read channel for this device is used to report changes to
 206  * userland in realtime.  We are required to free the data as well as
 207  * the n1 object because we allocate them separately.  Also note that
 208  * we return one record at a time.  If you try to read this device a
 209  * character at a time, you will lose the rest of the data.  Listening
 210  * programs are expected to cope.
 211  */
 212 static int
 213 devread(struct dev_read_args *ap)
 214 {
 215         struct uio *uio = ap->a_uio;
 216         struct dev_event_info *n1;
 217         int rv;
 218
 219         lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 220         while (TAILQ_EMPTY(&devsoftc.devq)) {
 221                 if (devsoftc.nonblock) {
 222                         lockmgr(&devsoftc.lock, LK_RELEASE);
 223                         return (EAGAIN);
 224                 }
 225                 tsleep_interlock(&devsoftc, PCATCH);
 226                 lockmgr(&devsoftc.lock, LK_RELEASE);
 227                 rv = tsleep(&devsoftc, PCATCH | PINTERLOCKED, "devctl", 0);
 228                 lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 229                 if (rv) {
 230                         /*
 231                          * Need to translate ERESTART to EINTR here? -- jake
 232                          */
 233                         lockmgr(&devsoftc.lock, LK_RELEASE);
 234                         return (rv);
 235                 }
 236         }
 237         n1 = TAILQ_FIRST(&devsoftc.devq);
 238         TAILQ_REMOVE(&devsoftc.devq, n1, dei_link);
 239         lockmgr(&devsoftc.lock, LK_RELEASE);
 240         rv = uiomove(n1->dei_data, strlen(n1->dei_data), uio);
 241         kfree(n1->dei_data, M_BUS);
 242         kfree(n1, M_BUS);
 243         return (rv);
 244 }
 245
 246 static  int
 247 devioctl(struct dev_ioctl_args *ap)
 248 {
 249         switch (ap->a_cmd) {
 250
 251         case FIONBIO:
 252                 if (*(int*)ap->a_data)
 253                         devsoftc.nonblock = 1;
 254                 else
 255                         devsoftc.nonblock = 0;
 256                 return (0);
 257         case FIOASYNC:
 258                 if (*(int*)ap->a_data)
 259                         devsoftc.async_proc = curproc;
 260                 else
 261                         devsoftc.async_proc = NULL;
 262                 return (0);
 263
 264                 /* (un)Support for other fcntl() calls. */
 265         case FIOCLEX:
 266         case FIONCLEX:
 267         case FIONREAD:
 268         case FIOSETOWN:
 269         case FIOGETOWN:
 270         default:
 271                 break;
 272         }
 273         return (ENOTTY);
 274 }
 275
 276 static void dev_filter_detach(struct knote *);
 277 static int dev_filter_read(struct knote *, long);
 278
 279 static struct filterops dev_filtops =
 280         { FILTEROP_ISFD, NULL, dev_filter_detach, dev_filter_read };
 281
 282 static int
 283 devkqfilter(struct dev_kqfilter_args *ap)
 284 {
 285         struct knote *kn = ap->a_kn;
 286         struct klist *klist;
 287
 288         ap->a_result = 0;
 289         lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 290
 291         switch (kn->kn_filter) {
 292         case EVFILT_READ:
 293                 kn->kn_fop = &dev_filtops;
 294                 break;
 295         default:
 296                 ap->a_result = EOPNOTSUPP;
 297                 lockmgr(&devsoftc.lock, LK_RELEASE);
 298                 return (0);
 299         }
 300
 301         klist = &devsoftc.kq.ki_note;
 302         knote_insert(klist, kn);
 303
 304         lockmgr(&devsoftc.lock, LK_RELEASE);
 305
 306         return (0);
 307 }
 308
 309 static void
 310 dev_filter_detach(struct knote *kn)
 311 {
 312         struct klist *klist;
 313
 314         lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 315         klist = &devsoftc.kq.ki_note;
 316         knote_remove(klist, kn);
 317         lockmgr(&devsoftc.lock, LK_RELEASE);
 318 }
 319
 320 static int
 321 dev_filter_read(struct knote *kn, long hint)
 322 {
 323         int ready = 0;
 324
 325         lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 326         if (!TAILQ_EMPTY(&devsoftc.devq))
 327                 ready = 1;
 328         lockmgr(&devsoftc.lock, LK_RELEASE);
 329
 330         return (ready);
 331 }
 332
 333
 334 /**
 335  * @brief Return whether the userland process is running
 336  */
 337 boolean_t
 338 devctl_process_running(void)
 339 {
 340         return (devsoftc.inuse == 1);
 341 }
 342
 343 /**
 344  * @brief Queue data to be read from the devctl device
 345  *
 346  * Generic interface to queue data to the devctl device.  It is
 347  * assumed that @p data is properly formatted.  It is further assumed
 348  * that @p data is allocated using the M_BUS malloc type.
 349  */
 350 void
 351 devctl_queue_data(char *data)
 352 {
 353         struct dev_event_info *n1 = NULL;
 354         struct proc *p;
 355
 356         n1 = kmalloc(sizeof(*n1), M_BUS, M_NOWAIT);
 357         if (n1 == NULL)
 358                 return;
 359         n1->dei_data = data;
 360         lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 361         TAILQ_INSERT_TAIL(&devsoftc.devq, n1, dei_link);
 362         wakeup(&devsoftc);
 363         lockmgr(&devsoftc.lock, LK_RELEASE);
 364         get_mplock();   /* XXX */
 365         KNOTE(&devsoftc.kq.ki_note, 0);
 366         rel_mplock();   /* XXX */
 367         p = devsoftc.async_proc;
 368         if (p != NULL)
 369                 ksignal(p, SIGIO);
 370 }
 371
 372 /**
 373  * @brief Send a 'notification' to userland, using standard ways
 374  */
 375 void
 376 devctl_notify(const char *system, const char *subsystem, const char *type,
 377     const char *data)
 378 {
 379         int len = 0;
 380         char *msg;
 381
 382         if (system == NULL)
 383                 return;         /* BOGUS!  Must specify system. */
 384         if (subsystem == NULL)
 385                 return;         /* BOGUS!  Must specify subsystem. */
 386         if (type == NULL)
 387                 return;         /* BOGUS!  Must specify type. */
 388         len += strlen(" system=") + strlen(system);
 389         len += strlen(" subsystem=") + strlen(subsystem);
 390         len += strlen(" type=") + strlen(type);
 391         /* add in the data message plus newline. */
 392         if (data != NULL)
 393                 len += strlen(data);
 394         len += 3;       /* '!', '\n', and NUL */
 395         msg = kmalloc(len, M_BUS, M_NOWAIT);
 396         if (msg == NULL)
 397                 return;         /* Drop it on the floor */
 398         if (data != NULL)
 399                 ksnprintf(msg, len, "!system=%s subsystem=%s type=%s %s\n",
 400                     system, subsystem, type, data);
 401         else
 402                 ksnprintf(msg, len, "!system=%s subsystem=%s type=%s\n",
 403                     system, subsystem, type);
 404         devctl_queue_data(msg);
 405 }
 406
 407 /*
 408  * Common routine that tries to make sending messages as easy as possible.
 409  * We allocate memory for the data, copy strings into that, but do not
 410  * free it unless there's an error.  The dequeue part of the driver should
 411  * free the data.  We don't send data when the device is disabled.  We do
 412  * send data, even when we have no listeners, because we wish to avoid
 413  * races relating to startup and restart of listening applications.
 414  *
 415  * devaddq is designed to string together the type of event, with the
 416  * object of that event, plus the plug and play info and location info
 417  * for that event.  This is likely most useful for devices, but less
 418  * useful for other consumers of this interface.  Those should use
 419  * the devctl_queue_data() interface instead.
 420  */
 421 static void
 422 devaddq(const char *type, const char *what, device_t dev)
 423 {
 424         char *data = NULL;
 425         char *loc = NULL;
 426         char *pnp = NULL;
 427         const char *parstr;
 428
 429         if (devctl_disable)
 430                 return;
 431         data = kmalloc(1024, M_BUS, M_NOWAIT);
 432         if (data == NULL)
 433                 goto bad;
 434
 435         /* get the bus specific location of this device */
 436         loc = kmalloc(1024, M_BUS, M_NOWAIT);
 437         if (loc == NULL)
 438                 goto bad;
 439         *loc = '\0';
 440         bus_child_location_str(dev, loc, 1024);
 441
 442         /* Get the bus specific pnp info of this device */
 443         pnp = kmalloc(1024, M_BUS, M_NOWAIT);
 444         if (pnp == NULL)
 445                 goto bad;
 446         *pnp = '\0';
 447         bus_child_pnpinfo_str(dev, pnp, 1024);
 448
 449         /* Get the parent of this device, or / if high enough in the tree. */
 450         if (device_get_parent(dev) == NULL)
 451                 parstr = ".";   /* Or '/' ? */
 452         else
 453                 parstr = device_get_nameunit(device_get_parent(dev));
 454         /* String it all together. */
 455         ksnprintf(data, 1024, "%s%s at %s %s on %s\n", type, what, loc, pnp,
 456           parstr);
 457         kfree(loc, M_BUS);
 458         kfree(pnp, M_BUS);
 459         devctl_queue_data(data);
 460         return;
 461 bad:
 462         kfree(pnp, M_BUS);
 463         kfree(loc, M_BUS);
 464         kfree(data, M_BUS);
 465         return;
 466 }
 467
 468 /*
 469  * A device was added to the tree.  We are called just after it successfully
 470  * attaches (that is, probe and attach success for this device).  No call
 471  * is made if a device is merely parented into the tree.  See devnomatch
 472  * if probe fails.  If attach fails, no notification is sent (but maybe
 473  * we should have a different message for this).
 474  */
 475 static void
 476 devadded(device_t dev)
 477 {
 478         char *pnp = NULL;
 479         char *tmp = NULL;
 480
 481         pnp = kmalloc(1024, M_BUS, M_NOWAIT);
 482         if (pnp == NULL)
 483                 goto fail;
 484         tmp = kmalloc(1024, M_BUS, M_NOWAIT);
 485         if (tmp == NULL)
 486                 goto fail;
 487         *pnp = '\0';
 488         bus_child_pnpinfo_str(dev, pnp, 1024);
 489         ksnprintf(tmp, 1024, "%s %s", device_get_nameunit(dev), pnp);
 490         devaddq("+", tmp, dev);
 491 fail:
 492         if (pnp != NULL)
 493                 kfree(pnp, M_BUS);
 494         if (tmp != NULL)
 495                 kfree(tmp, M_BUS);
 496         return;
 497 }
 498
 499 /*
 500  * A device was removed from the tree.  We are called just before this
 501  * happens.
 502  */
 503 static void
 504 devremoved(device_t dev)
 505 {
 506         char *pnp = NULL;
 507         char *tmp = NULL;
 508
 509         pnp = kmalloc(1024, M_BUS, M_NOWAIT);
 510         if (pnp == NULL)
 511                 goto fail;
 512         tmp = kmalloc(1024, M_BUS, M_NOWAIT);
 513         if (tmp == NULL)
 514                 goto fail;
 515         *pnp = '\0';
 516         bus_child_pnpinfo_str(dev, pnp, 1024);
 517         ksnprintf(tmp, 1024, "%s %s", device_get_nameunit(dev), pnp);
 518         devaddq("-", tmp, dev);
 519 fail:
 520         if (pnp != NULL)
 521                 kfree(pnp, M_BUS);
 522         if (tmp != NULL)
 523                 kfree(tmp, M_BUS);
 524         return;
 525 }
 526
 527 /*
 528  * Called when there's no match for this device.  This is only called
 529  * the first time that no match happens, so we don't keep getitng this
 530  * message.  Should that prove to be undesirable, we can change it.
 531  * This is called when all drivers that can attach to a given bus
 532  * decline to accept this device.  Other errrors may not be detected.
 533  */
 534 static void
 535 devnomatch(device_t dev)
 536 {
 537         devaddq("?", "", dev);
 538 }
 539
 540 static int
 541 sysctl_devctl_disable(SYSCTL_HANDLER_ARGS)
 542 {
 543         struct dev_event_info *n1;
 544         int dis, error;
 545
 546         dis = devctl_disable;
 547         error = sysctl_handle_int(oidp, &dis, 0, req);
 548         if (error || !req->newptr)
 549                 return (error);
 550         lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 551         devctl_disable = dis;
 552         if (dis) {
 553                 while (!TAILQ_EMPTY(&devsoftc.devq)) {
 554                         n1 = TAILQ_FIRST(&devsoftc.devq);
 555                         TAILQ_REMOVE(&devsoftc.devq, n1, dei_link);
 556                         kfree(n1->dei_data, M_BUS);
 557                         kfree(n1, M_BUS);
 558                 }
 559         }
 560         lockmgr(&devsoftc.lock, LK_RELEASE);
 561         return (0);
 562 }
 563
 564 /* End of /dev/devctl code */
 565
 566 TAILQ_HEAD(,device)     bus_data_devices;
 567 static int bus_data_generation = 1;
 568
 569 kobj_method_t null_methods[] = {
 570         { 0, 0 }
 571 };
 572
 573 DEFINE_CLASS(null, null_methods, 0);
 574
 575 /*
 576  * Devclass implementation
 577  */
 578
 579 static devclass_list_t devclasses = TAILQ_HEAD_INITIALIZER(devclasses);
 580
 581 static devclass_t
 582 devclass_find_internal(const char *classname, const char *parentname,
 583                        int create)
 584 {
 585         devclass_t dc;
 586
 587         PDEBUG(("looking for %s", classname));
 588         if (classname == NULL)
 589                 return(NULL);
 590
 591         TAILQ_FOREACH(dc, &devclasses, link)
 592                 if (!strcmp(dc->name, classname))
 593                         break;
 594
 595         if (create && !dc) {
 596                 PDEBUG(("creating %s", classname));
 597                 dc = kmalloc(sizeof(struct devclass) + strlen(classname) + 1,
 598                             M_BUS, M_INTWAIT | M_ZERO);
 599                 if (!dc)
 600                         return(NULL);
 601                 dc->parent = NULL;
 602                 dc->name = (char*) (dc + 1);
 603                 strcpy(dc->name, classname);
 604                 dc->devices = NULL;
 605                 dc->maxunit = 0;
 606                 TAILQ_INIT(&dc->drivers);
 607                 TAILQ_INSERT_TAIL(&devclasses, dc, link);
 608
 609                 bus_data_generation_update();
 610
 611         }
 612         if (parentname && dc && !dc->parent)
 613                 dc->parent = devclass_find_internal(parentname, NULL, FALSE);
 614
 615         return(dc);
 616 }
 617
 618 devclass_t
 619 devclass_create(const char *classname)
 620 {
 621         return(devclass_find_internal(classname, NULL, TRUE));
 622 }
 623
 624 devclass_t
 625 devclass_find(const char *classname)
 626 {
 627         return(devclass_find_internal(classname, NULL, FALSE));
 628 }
 629
 630 device_t
 631 devclass_find_unit(const char *classname, int unit)
 632 {
 633         devclass_t dc;
 634
 635         if ((dc = devclass_find(classname)) != NULL)
 636             return(devclass_get_device(dc, unit));
 637         return (NULL);
 638 }
 639
 640 int
 641 devclass_add_driver(devclass_t dc, driver_t *driver)
 642 {
 643         driverlink_t dl;
 644         device_t dev;
 645         int i;
 646
 647         PDEBUG(("%s", DRIVERNAME(driver)));
 648
 649         dl = kmalloc(sizeof *dl, M_BUS, M_INTWAIT | M_ZERO);
 650         if (!dl)
 651                 return(ENOMEM);
 652
 653         /*
 654          * Compile the driver's methods. Also increase the reference count
 655          * so that the class doesn't get freed when the last instance
 656          * goes. This means we can safely use static methods and avoids a
 657          * double-free in devclass_delete_driver.
 658          */
 659         kobj_class_instantiate(driver);
 660
 661         /*
 662          * Make sure the devclass which the driver is implementing exists.
 663          */
 664         devclass_find_internal(driver->name, NULL, TRUE);
 665
 666         dl->driver = driver;
 667         TAILQ_INSERT_TAIL(&dc->drivers, dl, link);
 668
 669         /*
 670          * Call BUS_DRIVER_ADDED for any existing busses in this class,
 671          * but only if the bus has already been attached (otherwise we
 672          * might probe too early).
 673          *
 674          * This is what will cause a newly loaded module to be associated
 675          * with hardware.  bus_generic_driver_added() is typically what ends
 676          * up being called.
 677          */
 678         for (i = 0; i < dc->maxunit; i++) {
 679                 if ((dev = dc->devices[i]) != NULL) {
 680                         if (dev->state >= DS_ATTACHED)
 681                                 BUS_DRIVER_ADDED(dev, driver);
 682                 }
 683         }
 684
 685         bus_data_generation_update();
 686         return(0);
 687 }
 688
 689 int
 690 devclass_delete_driver(devclass_t busclass, driver_t *driver)
 691 {
 692         devclass_t dc = devclass_find(driver->name);
 693         driverlink_t dl;
 694         device_t dev;
 695         int i;
 696         int error;
 697
 698         PDEBUG(("%s from devclass %s", driver->name, DEVCLANAME(busclass)));
 699
 700         if (!dc)
 701                 return(0);
 702
 703         /*
 704          * Find the link structure in the bus' list of drivers.
 705          */
 706         TAILQ_FOREACH(dl, &busclass->drivers, link)
 707                 if (dl->driver == driver)
 708                         break;
 709
 710         if (!dl) {
 711                 PDEBUG(("%s not found in %s list", driver->name, busclass->name));
 712                 return(ENOENT);
 713         }
 714
 715         /*
 716          * Disassociate from any devices.  We iterate through all the
 717          * devices in the devclass of the driver and detach any which are
 718          * using the driver and which have a parent in the devclass which
 719          * we are deleting from.
 720          *
 721          * Note that since a driver can be in multiple devclasses, we
 722          * should not detach devices which are not children of devices in
 723          * the affected devclass.
 724          */
 725         for (i = 0; i < dc->maxunit; i++)
 726                 if (dc->devices[i]) {
 727                         dev = dc->devices[i];
 728                         if (dev->driver == driver && dev->parent &&
 729                             dev->parent->devclass == busclass) {
 730                                 if ((error = device_detach(dev)) != 0)
 731                                         return(error);
 732                                 device_set_driver(dev, NULL);
 733                         }
 734                 }
 735
 736         TAILQ_REMOVE(&busclass->drivers, dl, link);
 737         kfree(dl, M_BUS);
 738
 739         kobj_class_uninstantiate(driver);
 740
 741         bus_data_generation_update();
 742         return(0);
 743 }
 744
 745 static driverlink_t
 746 devclass_find_driver_internal(devclass_t dc, const char *classname)
 747 {
 748         driverlink_t dl;
 749
 750         PDEBUG(("%s in devclass %s", classname, DEVCLANAME(dc)));
 751
 752         TAILQ_FOREACH(dl, &dc->drivers, link)
 753                 if (!strcmp(dl->driver->name, classname))
 754                         return(dl);
 755
 756         PDEBUG(("not found"));
 757         return(NULL);
 758 }
 759
 760 kobj_class_t
 761 devclass_find_driver(devclass_t dc, const char *classname)
 762 {
 763         driverlink_t dl;
 764
 765         dl = devclass_find_driver_internal(dc, classname);
 766         if (dl)
 767                 return(dl->driver);
 768         else
 769                 return(NULL);
 770 }
 771
 772 const char *
 773 devclass_get_name(devclass_t dc)
 774 {
 775         return(dc->name);
 776 }
 777
 778 device_t
 779 devclass_get_device(devclass_t dc, int unit)
 780 {
 781         if (dc == NULL || unit < 0 || unit >= dc->maxunit)
 782                 return(NULL);
 783         return(dc->devices[unit]);
 784 }
 785
 786 void *
 787 devclass_get_softc(devclass_t dc, int unit)
 788 {
 789         device_t dev;
 790
 791         dev = devclass_get_device(dc, unit);
 792         if (!dev)
 793                 return(NULL);
 794
 795         return(device_get_softc(dev));
 796 }
 797
 798 int
 799 devclass_get_devices(devclass_t dc, device_t **devlistp, int *devcountp)
 800 {
 801         int i;
 802         int count;
 803         device_t *list;
 804
 805         count = 0;
 806         for (i = 0; i < dc->maxunit; i++)
 807                 if (dc->devices[i])
 808                         count++;
 809
 810         list = kmalloc(count * sizeof(device_t), M_TEMP, M_INTWAIT | M_ZERO);
 811         if (list == NULL)
 812                 return(ENOMEM);
 813
 814         count = 0;
 815         for (i = 0; i < dc->maxunit; i++)
 816                 if (dc->devices[i]) {
 817                         list[count] = dc->devices[i];
 818                         count++;
 819                 }
 820
 821         *devlistp = list;
 822         *devcountp = count;
 823
 824         return(0);
 825 }
 826
 827 /**
 828  * @brief Get a list of drivers in the devclass
 829  *
 830  * An array containing a list of pointers to all the drivers in the
 831  * given devclass is allocated and returned in @p *listp.  The number
 832  * of drivers in the array is returned in @p *countp. The caller should
 833  * free the array using @c free(p, M_TEMP).
 834  *
 835  * @param dc            the devclass to examine
 836  * @param listp         gives location for array pointer return value
 837  * @param countp        gives location for number of array elements
 838  *                      return value
 839  *
 840  * @retval 0            success
 841  * @retval ENOMEM       the array allocation failed
 842  */
 843 int
 844 devclass_get_drivers(devclass_t dc, driver_t ***listp, int *countp)
 845 {
 846         driverlink_t dl;
 847         driver_t **list;
 848         int count;
 849
 850         count = 0;
 851         TAILQ_FOREACH(dl, &dc->drivers, link)
 852                 count++;
 853         list = kmalloc(count * sizeof(driver_t *), M_TEMP, M_NOWAIT);
 854         if (list == NULL)
 855                 return (ENOMEM);
 856
 857         count = 0;
 858         TAILQ_FOREACH(dl, &dc->drivers, link) {
 859                 list[count] = dl->driver;
 860                 count++;
 861         }
 862         *listp = list;
 863         *countp = count;
 864
 865         return (0);
 866 }
 867
 868 /**
 869  * @brief Get the number of devices in a devclass
 870  *
 871  * @param dc            the devclass to examine
 872  */
 873 int
 874 devclass_get_count(devclass_t dc)
 875 {
 876         int count, i;
 877
 878         count = 0;
 879         for (i = 0; i < dc->maxunit; i++)
 880                 if (dc->devices[i])
 881                         count++;
 882         return (count);
 883 }
 884
 885 int
 886 devclass_get_maxunit(devclass_t dc)
 887 {
 888         return(dc->maxunit);
 889 }
 890
 891 void
 892 devclass_set_parent(devclass_t dc, devclass_t pdc)
 893 {
 894         dc->parent = pdc;
 895 }
 896
 897 devclass_t
 898 devclass_get_parent(devclass_t dc)
 899 {
 900         return(dc->parent);
 901 }
 902
 903 static int
 904 devclass_alloc_unit(devclass_t dc, int *unitp)
 905 {
 906         int unit = *unitp;
 907
 908         PDEBUG(("unit %d in devclass %s", unit, DEVCLANAME(dc)));
 909
 910         /* If we have been given a wired unit number, check for existing device */
 911         if (unit != -1) {
 912                 if (unit >= 0 && unit < dc->maxunit &&
 913                     dc->devices[unit] != NULL) {
 914                         if (bootverbose)
 915                                 kprintf("%s-: %s%d exists, using next available unit number\n",
 916                                        dc->name, dc->name, unit);
 917                         /* find the next available slot */
 918                         while (++unit < dc->maxunit && dc->devices[unit] != NULL)
 919                                 ;
 920                 }
 921         } else {
 922                 /* Unwired device, find the next available slot for it */
 923                 unit = 0;
 924                 while (unit < dc->maxunit && dc->devices[unit] != NULL)
 925                         unit++;
 926         }
 927
 928         /*
 929          * We've selected a unit beyond the length of the table, so let's
 930          * extend the table to make room for all units up to and including
 931          * this one.
 932          */
 933         if (unit >= dc->maxunit) {
 934                 device_t *newlist;
 935                 int newsize;
 936
 937                 newsize = roundup((unit + 1), MINALLOCSIZE / sizeof(device_t));
 938                 newlist = kmalloc(sizeof(device_t) * newsize, M_BUS,
 939                                  M_INTWAIT | M_ZERO);
 940                 if (newlist == NULL)
 941                         return(ENOMEM);
 942                 bcopy(dc->devices, newlist, sizeof(device_t) * dc->maxunit);
 943                 if (dc->devices)
 944                         kfree(dc->devices, M_BUS);
 945                 dc->devices = newlist;
 946                 dc->maxunit = newsize;
 947         }
 948         PDEBUG(("now: unit %d in devclass %s", unit, DEVCLANAME(dc)));
 949
 950         *unitp = unit;
 951         return(0);
 952 }
 953
 954 static int
 955 devclass_add_device(devclass_t dc, device_t dev)
 956 {
 957         int buflen, error;
 958
 959         PDEBUG(("%s in devclass %s", DEVICENAME(dev), DEVCLANAME(dc)));
 960
 961         buflen = strlen(dc->name) + 5;
 962         dev->nameunit = kmalloc(buflen, M_BUS, M_INTWAIT | M_ZERO);
 963         if (!dev->nameunit)
 964                 return(ENOMEM);
 965
 966         if ((error = devclass_alloc_unit(dc, &dev->unit)) != 0) {
 967                 kfree(dev->nameunit, M_BUS);
 968                 dev->nameunit = NULL;
 969                 return(error);
 970         }
 971         dc->devices[dev->unit] = dev;
 972         dev->devclass = dc;
 973         ksnprintf(dev->nameunit, buflen, "%s%d", dc->name, dev->unit);
 974
 975         return(0);
 976 }
 977
 978 static int
 979 devclass_delete_device(devclass_t dc, device_t dev)
 980 {
 981         if (!dc || !dev)
 982                 return(0);
 983
 984         PDEBUG(("%s in devclass %s", DEVICENAME(dev), DEVCLANAME(dc)));
 985
 986         if (dev->devclass != dc || dc->devices[dev->unit] != dev)
 987                 panic("devclass_delete_device: inconsistent device class");
 988         dc->devices[dev->unit] = NULL;
 989         if (dev->flags & DF_WILDCARD)
 990                 dev->unit = -1;
 991         dev->devclass = NULL;
 992         kfree(dev->nameunit, M_BUS);
 993         dev->nameunit = NULL;
 994
 995         return(0);
 996 }
 997
 998 static device_t
 999 make_device(device_t parent, const char *name, int unit)
1000 {
1001         device_t dev;
1002         devclass_t dc;
1003
1004         PDEBUG(("%s at %s as unit %d", name, DEVICENAME(parent), unit));
1005
1006         if (name != NULL) {
1007                 dc = devclass_find_internal(name, NULL, TRUE);
1008                 if (!dc) {
1009                         kprintf("make_device: can't find device class %s\n", name);
1010                         return(NULL);
1011                 }
1012         } else
1013                 dc = NULL;
1014
1015         dev = kmalloc(sizeof(struct device), M_BUS, M_INTWAIT | M_ZERO);
1016         if (!dev)
1017                 return(0);
1018
1019         dev->parent = parent;
1020         TAILQ_INIT(&dev->children);
1021         kobj_init((kobj_t) dev, &null_class);
1022         dev->driver = NULL;
1023         dev->devclass = NULL;
1024         dev->unit = unit;
1025         dev->nameunit = NULL;
1026         dev->desc = NULL;
1027         dev->busy = 0;
1028         dev->devflags = 0;
1029         dev->flags = DF_ENABLED;
1030         dev->order = 0;
1031         if (unit == -1)
1032                 dev->flags |= DF_WILDCARD;
1033         if (name) {
1034                 dev->flags |= DF_FIXEDCLASS;
1035                 if (devclass_add_device(dc, dev) != 0) {
1036                         kobj_delete((kobj_t)dev, M_BUS);
1037                         return(NULL);
1038                 }
1039         }
1040         dev->ivars = NULL;
1041         dev->softc = NULL;
1042
1043         dev->state = DS_NOTPRESENT;
1044
1045         TAILQ_INSERT_TAIL(&bus_data_devices, dev, devlink);
1046         bus_data_generation_update();
1047
1048         return(dev);
1049 }
1050
1051 static int
1052 device_print_child(device_t dev, device_t child)
1053 {
1054         int retval = 0;
1055
1056         if (device_is_alive(child))
1057                 retval += BUS_PRINT_CHILD(dev, child);
1058         else
1059                 retval += device_printf(child, " not found\n");
1060
1061         return(retval);
1062 }
1063
1064 device_t
1065 device_add_child(device_t dev, const char *name, int unit)
1066 {
1067         return device_add_child_ordered(dev, 0, name, unit);
1068 }
1069
1070 device_t
1071 device_add_child_ordered(device_t dev, int order, const char *name, int unit)
1072 {
1073         device_t child;
1074         device_t place;
1075
1076         PDEBUG(("%s at %s with order %d as unit %d", name, DEVICENAME(dev),
1077                 order, unit));
1078
1079         child = make_device(dev, name, unit);
1080         if (child == NULL)
1081                 return child;
1082         child->order = order;
1083
1084         TAILQ_FOREACH(place, &dev->children, link)
1085                 if (place->order > order)
1086                         break;
1087
1088         if (place) {
1089                 /*
1090                  * The device 'place' is the first device whose order is
1091                  * greater than the new child.
1092                  */
1093                 TAILQ_INSERT_BEFORE(place, child, link);
1094         } else {
1095                 /*
1096                  * The new child's order is greater or equal to the order of
1097                  * any existing device. Add the child to the tail of the list.
1098                  */
1099                 TAILQ_INSERT_TAIL(&dev->children, child, link);
1100         }
1101
1102         bus_data_generation_update();
1103         return(child);
1104 }
1105
1106 int
1107 device_delete_child(device_t dev, device_t child)
1108 {
1109         int error;
1110         device_t grandchild;
1111
1112         PDEBUG(("%s from %s", DEVICENAME(child), DEVICENAME(dev)));
1113
1114         /* remove children first */
1115         while ( (grandchild = TAILQ_FIRST(&child->children)) ) {
1116                 error = device_delete_child(child, grandchild);
1117                 if (error)
1118                         return(error);
1119         }
1120
1121         if ((error = device_detach(child)) != 0)
1122                 return(error);
1123         if (child->devclass)
1124                 devclass_delete_device(child->devclass, child);
1125         TAILQ_REMOVE(&dev->children, child, link);
1126         TAILQ_REMOVE(&bus_data_devices, child, devlink);
1127         device_set_desc(child, NULL);
1128         kobj_delete((kobj_t)child, M_BUS);
1129
1130         bus_data_generation_update();
1131         return(0);
1132 }
1133
1134 /**
1135  * @brief Find a device given a unit number
1136  *
1137  * This is similar to devclass_get_devices() but only searches for
1138  * devices which have @p dev as a parent.
1139  *
1140  * @param dev           the parent device to search
1141  * @param unit          the unit number to search for.  If the unit is -1,
1142  *                      return the first child of @p dev which has name
1143  *                      @p classname (that is, the one with the lowest unit.)
1144  *
1145  * @returns             the device with the given unit number or @c
1146  *                      NULL if there is no such device
1147  */
1148 device_t
1149 device_find_child(device_t dev, const char *classname, int unit)
1150 {
1151         devclass_t dc;
1152         device_t child;
1153
1154         dc = devclass_find(classname);
1155         if (!dc)
1156                 return(NULL);
1157
1158         if (unit != -1) {
1159                 child = devclass_get_device(dc, unit);
1160                 if (child && child->parent == dev)
1161                         return (child);
1162         } else {
1163                 for (unit = 0; unit < devclass_get_maxunit(dc); unit++) {
1164                         child = devclass_get_device(dc, unit);
1165                         if (child && child->parent == dev)
1166                                 return (child);
1167                 }
1168         }
1169         return(NULL);
1170 }
1171
1172 static driverlink_t
1173 first_matching_driver(devclass_t dc, device_t dev)
1174 {
1175         if (dev->devclass)
1176                 return(devclass_find_driver_internal(dc, dev->devclass->name));
1177         else
1178                 return(TAILQ_FIRST(&dc->drivers));
1179 }
1180
1181 static driverlink_t
1182 next_matching_driver(devclass_t dc, device_t dev, driverlink_t last)
1183 {
1184         if (dev->devclass) {
1185                 driverlink_t dl;
1186                 for (dl = TAILQ_NEXT(last, link); dl; dl = TAILQ_NEXT(dl, link))
1187                         if (!strcmp(dev->devclass->name, dl->driver->name))
1188                                 return(dl);
1189                 return(NULL);
1190         } else
1191                 return(TAILQ_NEXT(last, link));
1192 }
1193
1194 static int
1195 device_probe_child(device_t dev, device_t child)
1196 {
1197         devclass_t dc;
1198         driverlink_t best = 0;
1199         driverlink_t dl;
1200         int result, pri = 0;
1201         int hasclass = (child->devclass != 0);
1202
1203         dc = dev->devclass;
1204         if (!dc)
1205                 panic("device_probe_child: parent device has no devclass");
1206
1207         if (child->state == DS_ALIVE)
1208                 return(0);
1209
1210         for (; dc; dc = dc->parent) {
1211                 for (dl = first_matching_driver(dc, child); dl;
1212                      dl = next_matching_driver(dc, child, dl)) {
1213                         PDEBUG(("Trying %s", DRIVERNAME(dl->driver)));
1214                         device_set_driver(child, dl->driver);
1215                         if (!hasclass)
1216                                 device_set_devclass(child, dl->driver->name);
1217                         result = DEVICE_PROBE(child);
1218                         if (!hasclass)
1219                                 device_set_devclass(child, 0);
1220
1221                         /*
1222                          * If the driver returns SUCCESS, there can be
1223                          * no higher match for this device.
1224                          */
1225                         if (result == 0) {
1226                                 best = dl;
1227                                 pri = 0;
1228                                 break;
1229                         }
1230
1231                         /*
1232                          * The driver returned an error so it
1233                          * certainly doesn't match.
1234                          */
1235                         if (result > 0) {
1236                                 device_set_driver(child, 0);
1237                                 continue;
1238                         }
1239
1240                         /*
1241                          * A priority lower than SUCCESS, remember the
1242                          * best matching driver. Initialise the value
1243                          * of pri for the first match.
1244                          */
1245                         if (best == 0 || result > pri) {
1246                                 best = dl;
1247                                 pri = result;
1248                                 continue;
1249                         }
1250                 }
1251                 /*
1252                  * If we have unambiguous match in this devclass,
1253                  * don't look in the parent.
1254                  */
1255                 if (best && pri == 0)
1256                         break;
1257         }
1258
1259         /*
1260          * If we found a driver, change state and initialise the devclass.
1261          */
1262         if (best) {
1263                 if (!child->devclass)
1264                         device_set_devclass(child, best->driver->name);
1265                 device_set_driver(child, best->driver);
1266                 if (pri < 0) {
1267                         /*
1268                          * A bit bogus. Call the probe method again to make
1269                          * sure that we have the right description.
1270                          */
1271                         DEVICE_PROBE(child);
1272                 }
1273
1274                 bus_data_generation_update();
1275                 child->state = DS_ALIVE;
1276                 return(0);
1277         }
1278
1279         return(ENXIO);
1280 }
1281
1282 device_t
1283 device_get_parent(device_t dev)
1284 {
1285         return dev->parent;
1286 }
1287
1288 int
1289 device_get_children(device_t dev, device_t **devlistp, int *devcountp)
1290 {
1291         int count;
1292         device_t child;
1293         device_t *list;
1294
1295         count = 0;
1296         TAILQ_FOREACH(child, &dev->children, link)
1297                 count++;
1298
1299         list = kmalloc(count * sizeof(device_t), M_TEMP, M_INTWAIT | M_ZERO);
1300         if (!list)
1301                 return(ENOMEM);
1302
1303         count = 0;
1304         TAILQ_FOREACH(child, &dev->children, link) {
1305                 list[count] = child;
1306                 count++;
1307         }
1308
1309         *devlistp = list;
1310         *devcountp = count;
1311
1312         return(0);
1313 }
1314
1315 driver_t *
1316 device_get_driver(device_t dev)
1317 {
1318         return(dev->driver);
1319 }
1320
1321 devclass_t
1322 device_get_devclass(device_t dev)
1323 {
1324         return(dev->devclass);
1325 }
1326
1327 const char *
1328 device_get_name(device_t dev)
1329 {
1330         if (dev->devclass)
1331                 return devclass_get_name(dev->devclass);
1332         return(NULL);
1333 }
1334
1335 const char *
1336 device_get_nameunit(device_t dev)
1337 {
1338         return(dev->nameunit);
1339 }
1340
1341 int
1342 device_get_unit(device_t dev)
1343 {
1344         return(dev->unit);
1345 }
1346
1347 const char *
1348 device_get_desc(device_t dev)
1349 {
1350         return(dev->desc);
1351 }
1352
1353 uint32_t
1354 device_get_flags(device_t dev)
1355 {
1356         return(dev->devflags);
1357 }
1358
1359 int
1360 device_print_prettyname(device_t dev)
1361 {
1362         const char *name = device_get_name(dev);
1363
1364         if (name == 0)
1365                 return kprintf("unknown: ");
1366         else
1367                 return kprintf("%s%d: ", name, device_get_unit(dev));
1368 }
1369
1370 int
1371 device_printf(device_t dev, const char * fmt, ...)
1372 {
1373         __va_list ap;
1374         int retval;
1375
1376         retval = device_print_prettyname(dev);
1377         __va_start(ap, fmt);
1378         retval += kvprintf(fmt, ap);
1379         __va_end(ap);
1380         return retval;
1381 }
1382
1383 static void
1384 device_set_desc_internal(device_t dev, const char* desc, int copy)
1385 {
1386         if (dev->desc && (dev->flags & DF_DESCMALLOCED)) {
1387                 kfree(dev->desc, M_BUS);
1388                 dev->flags &= ~DF_DESCMALLOCED;
1389                 dev->desc = NULL;
1390         }
1391
1392         if (copy && desc) {
1393                 dev->desc = kmalloc(strlen(desc) + 1, M_BUS, M_INTWAIT);
1394                 if (dev->desc) {
1395                         strcpy(dev->desc, desc);
1396                         dev->flags |= DF_DESCMALLOCED;
1397                 }
1398         } else {
1399                 /* Avoid a -Wcast-qual warning */
1400                 dev->desc = (char *)(uintptr_t) desc;
1401         }
1402
1403         bus_data_generation_update();
1404 }
1405
1406 void
1407 device_set_desc(device_t dev, const char* desc)
1408 {
1409         device_set_desc_internal(dev, desc, FALSE);
1410 }
1411
1412 void
1413 device_set_desc_copy(device_t dev, const char* desc)
1414 {
1415         device_set_desc_internal(dev, desc, TRUE);
1416 }
1417
1418 void
1419 device_set_flags(device_t dev, uint32_t flags)
1420 {
1421         dev->devflags = flags;
1422 }
1423
1424 void *
1425 device_get_softc(device_t dev)
1426 {
1427         return dev->softc;
1428 }
1429
1430 void
1431 device_set_softc(device_t dev, void *softc)
1432 {
1433         if (dev->softc && !(dev->flags & DF_EXTERNALSOFTC))
1434                 kfree(dev->softc, M_BUS);
1435         dev->softc = softc;
1436         if (dev->softc)
1437                 dev->flags |= DF_EXTERNALSOFTC;
1438         else
1439                 dev->flags &= ~DF_EXTERNALSOFTC;
1440 }
1441
1442 void
1443 device_set_async_attach(device_t dev, int enable)
1444 {
1445         if (enable)
1446                 dev->flags |= DF_ASYNCPROBE;
1447         else
1448                 dev->flags &= ~DF_ASYNCPROBE;
1449 }
1450
1451 void *
1452 device_get_ivars(device_t dev)
1453 {
1454         return dev->ivars;
1455 }
1456
1457 void
1458 device_set_ivars(device_t dev, void * ivars)
1459 {
1460         if (!dev)
1461                 return;
1462
1463         dev->ivars = ivars;
1464 }
1465
1466 device_state_t
1467 device_get_state(device_t dev)
1468 {
1469         return(dev->state);
1470 }
1471
1472 void
1473 device_enable(device_t dev)
1474 {
1475         dev->flags |= DF_ENABLED;
1476 }
1477
1478 void
1479 device_disable(device_t dev)
1480 {
1481         dev->flags &= ~DF_ENABLED;
1482 }
1483
1484 /*
1485  * YYY cannot block
1486  */
1487 void
1488 device_busy(device_t dev)
1489 {
1490         if (dev->state < DS_ATTACHED)
1491                 panic("device_busy: called for unattached device");
1492         if (dev->busy == 0 && dev->parent)
1493                 device_busy(dev->parent);
1494         dev->busy++;
1495         dev->state = DS_BUSY;
1496 }
1497
1498 /*
1499  * YYY cannot block
1500  */
1501 void
1502 device_unbusy(device_t dev)
1503 {
1504         if (dev->state != DS_BUSY)
1505                 panic("device_unbusy: called for non-busy device");
1506         dev->busy--;
1507         if (dev->busy == 0) {
1508                 if (dev->parent)
1509                         device_unbusy(dev->parent);
1510                 dev->state = DS_ATTACHED;
1511         }
1512 }
1513
1514 void
1515 device_quiet(device_t dev)
1516 {
1517         dev->flags |= DF_QUIET;
1518 }
1519
1520 void
1521 device_verbose(device_t dev)
1522 {
1523         dev->flags &= ~DF_QUIET;
1524 }
1525
1526 int
1527 device_is_quiet(device_t dev)
1528 {
1529         return((dev->flags & DF_QUIET) != 0);
1530 }
1531
1532 int
1533 device_is_enabled(device_t dev)
1534 {
1535         return((dev->flags & DF_ENABLED) != 0);
1536 }
1537
1538 int
1539 device_is_alive(device_t dev)
1540 {
1541         return(dev->state >= DS_ALIVE);
1542 }
1543
1544 int
1545 device_is_attached(device_t dev)
1546 {
1547         return(dev->state >= DS_ATTACHED);
1548 }
1549
1550 int
1551 device_set_devclass(device_t dev, const char *classname)
1552 {
1553         devclass_t dc;
1554         int error;
1555
1556         if (!classname) {
1557                 if (dev->devclass)
1558                         devclass_delete_device(dev->devclass, dev);
1559                 return(0);
1560         }
1561
1562         if (dev->devclass) {
1563                 kprintf("device_set_devclass: device class already set\n");
1564                 return(EINVAL);
1565         }
1566
1567         dc = devclass_find_internal(classname, NULL, TRUE);
1568         if (!dc)
1569                 return(ENOMEM);
1570
1571         error = devclass_add_device(dc, dev);
1572
1573         bus_data_generation_update();
1574         return(error);
1575 }
1576
1577 int
1578 device_set_driver(device_t dev, driver_t *driver)
1579 {
1580         if (dev->state >= DS_ATTACHED)
1581                 return(EBUSY);
1582
1583         if (dev->driver == driver)
1584                 return(0);
1585
1586         if (dev->softc && !(dev->flags & DF_EXTERNALSOFTC)) {
1587                 kfree(dev->softc, M_BUS);
1588                 dev->softc = NULL;
1589         }
1590         kobj_delete((kobj_t) dev, 0);
1591         dev->driver = driver;
1592         if (driver) {
1593                 kobj_init((kobj_t) dev, (kobj_class_t) driver);
1594                 if (!(dev->flags & DF_EXTERNALSOFTC)) {
1595                         dev->softc = kmalloc(driver->size, M_BUS,
1596                                             M_INTWAIT | M_ZERO);
1597                         if (!dev->softc) {
1598                                 kobj_delete((kobj_t)dev, 0);
1599                                 kobj_init((kobj_t) dev, &null_class);
1600                                 dev->driver = NULL;
1601                                 return(ENOMEM);
1602                         }
1603                 }
1604         } else {
1605                 kobj_init((kobj_t) dev, &null_class);
1606         }
1607
1608         bus_data_generation_update();
1609         return(0);
1610 }
1611
1612 int
1613 device_probe_and_attach(device_t dev)
1614 {
1615         device_t bus = dev->parent;
1616         int error = 0;
1617
1618         if (dev->state >= DS_ALIVE)
1619                 return(0);
1620
1621         if ((dev->flags & DF_ENABLED) == 0) {
1622                 if (bootverbose) {
1623                         device_print_prettyname(dev);
1624                         kprintf("not probed (disabled)\n");
1625                 }
1626                 return(0);
1627         }
1628
1629         error = device_probe_child(bus, dev);
1630         if (error) {
1631                 if (!(dev->flags & DF_DONENOMATCH)) {
1632                         BUS_PROBE_NOMATCH(bus, dev);
1633                         devnomatch(dev);
1634                         dev->flags |= DF_DONENOMATCH;
1635                 }
1636                 return(error);
1637         }
1638
1639         /*
1640          * Output the exact device chain prior to the attach in case the
1641          * system locks up during attach, and generate the full info after
1642          * the attach so correct irq and other information is displayed.
1643          */
1644         if (bootverbose && !device_is_quiet(dev)) {
1645                 device_t tmp;
1646
1647                 kprintf("%s", device_get_nameunit(dev));
1648                 for (tmp = dev->parent; tmp; tmp = tmp->parent)
1649                         kprintf(".%s", device_get_nameunit(tmp));
1650                 kprintf("\n");
1651         }
1652         if (!device_is_quiet(dev))
1653                 device_print_child(bus, dev);
1654         if ((dev->flags & DF_ASYNCPROBE) && do_async_attach) {
1655                 kprintf("%s: probing asynchronously\n",
1656                         device_get_nameunit(dev));
1657                 dev->state = DS_INPROGRESS;
1658                 device_attach_async(dev);
1659                 error = 0;
1660         } else {
1661                 error = device_doattach(dev);
1662         }
1663         return(error);
1664 }
1665
1666 /*
1667  * Device is known to be alive, do the attach asynchronously.
1668  * However, serialize the attaches with the mp lock.
1669  */
1670 static void
1671 device_attach_async(device_t dev)
1672 {
1673         thread_t td;
1674
1675         atomic_add_int(&numasyncthreads, 1);
1676         lwkt_create(device_attach_thread, dev, &td, NULL,
1677                     0, 0, (dev->desc ? dev->desc : "devattach"));
1678 }
1679
1680 static void
1681 device_attach_thread(void *arg)
1682 {
1683         device_t dev = arg;
1684
1685         get_mplock();   /* XXX replace with devattach_token later */
1686         (void)device_doattach(dev);
1687         atomic_subtract_int(&numasyncthreads, 1);
1688         wakeup(&numasyncthreads);
1689         rel_mplock();   /* XXX replace with devattach_token later */
1690 }
1691
1692 /*
1693  * Device is known to be alive, do the attach (synchronous or asynchronous)
1694  */
1695 static int
1696 device_doattach(device_t dev)
1697 {
1698         device_t bus = dev->parent;
1699         int hasclass = (dev->devclass != 0);
1700         int error;
1701
1702         error = DEVICE_ATTACH(dev);
1703         if (error == 0) {
1704                 dev->state = DS_ATTACHED;
1705                 if (bootverbose && !device_is_quiet(dev))
1706                         device_print_child(bus, dev);
1707                 devadded(dev);
1708         } else {
1709                 kprintf("device_probe_and_attach: %s%d attach returned %d\n",
1710                        dev->driver->name, dev->unit, error);
1711                 /* Unset the class that was set in device_probe_child */
1712                 if (!hasclass)
1713                         device_set_devclass(dev, 0);
1714                 device_set_driver(dev, NULL);
1715                 dev->state = DS_NOTPRESENT;
1716         }
1717         return(error);
1718 }
1719
1720 int
1721 device_detach(device_t dev)
1722 {
1723         int error;
1724
1725         PDEBUG(("%s", DEVICENAME(dev)));
1726         if (dev->state == DS_BUSY)
1727                 return(EBUSY);
1728         if (dev->state != DS_ATTACHED)
1729                 return(0);
1730
1731         if ((error = DEVICE_DETACH(dev)) != 0)
1732                 return(error);
1733         devremoved(dev);
1734         device_printf(dev, "detached\n");
1735         if (dev->parent)
1736                 BUS_CHILD_DETACHED(dev->parent, dev);
1737
1738         if (!(dev->flags & DF_FIXEDCLASS))
1739                 devclass_delete_device(dev->devclass, dev);
1740
1741         dev->state = DS_NOTPRESENT;
1742         device_set_driver(dev, NULL);
1743
1744         return(0);
1745 }
1746
1747 int
1748 device_shutdown(device_t dev)
1749 {
1750         if (dev->state < DS_ATTACHED)
1751                 return 0;
1752         PDEBUG(("%s", DEVICENAME(dev)));
1753         return DEVICE_SHUTDOWN(dev);
1754 }
1755
1756 int
1757 device_set_unit(device_t dev, int unit)
1758 {
1759         devclass_t dc;
1760         int err;
1761
1762         dc = device_get_devclass(dev);
1763         if (unit < dc->maxunit && dc->devices[unit])
1764                 return(EBUSY);
1765         err = devclass_delete_device(dc, dev);
1766         if (err)
1767                 return(err);
1768         dev->unit = unit;
1769         err = devclass_add_device(dc, dev);
1770         if (err)
1771                 return(err);
1772
1773         bus_data_generation_update();
1774         return(0);
1775 }
1776
1777 /*======================================*/
1778 /*
1779  * Access functions for device resources.
1780  */
1781
1782 /* Supplied by config(8) in ioconf.c */
1783 extern struct config_device config_devtab[];
1784 extern int devtab_count;
1785
1786 /* Runtime version */
1787 struct config_device *devtab = config_devtab;
1788
1789 static int
1790 resource_new_name(const char *name, int unit)
1791 {
1792         struct config_device *new;
1793
1794         new = kmalloc((devtab_count + 1) * sizeof(*new), M_TEMP,
1795                      M_INTWAIT | M_ZERO);
1796         if (new == NULL)
1797                 return(-1);
1798         if (devtab && devtab_count > 0)
1799                 bcopy(devtab, new, devtab_count * sizeof(*new));
1800         new[devtab_count].name = kmalloc(strlen(name) + 1, M_TEMP, M_INTWAIT);
1801         if (new[devtab_count].name == NULL) {
1802                 kfree(new, M_TEMP);
1803                 return(-1);
1804         }
1805         strcpy(new[devtab_count].name, name);
1806         new[devtab_count].unit = unit;
1807         new[devtab_count].resource_count = 0;
1808         new[devtab_count].resources = NULL;
1809         if (devtab && devtab != config_devtab)
1810                 kfree(devtab, M_TEMP);
1811         devtab = new;
1812         return devtab_count++;
1813 }
1814
1815 static int
1816 resource_new_resname(int j, const char *resname, resource_type type)
1817 {
1818         struct config_resource *new;
1819         int i;
1820
1821         i = devtab[j].resource_count;
1822         new = kmalloc((i + 1) * sizeof(*new), M_TEMP, M_INTWAIT | M_ZERO);
1823         if (new == NULL)
1824                 return(-1);
1825         if (devtab[j].resources && i > 0)
1826                 bcopy(devtab[j].resources, new, i * sizeof(*new));
1827         new[i].name = kmalloc(strlen(resname) + 1, M_TEMP, M_INTWAIT);
1828         if (new[i].name == NULL) {
1829                 kfree(new, M_TEMP);
1830                 return(-1);
1831         }
1832         strcpy(new[i].name, resname);
1833         new[i].type = type;
1834         if (devtab[j].resources)
1835                 kfree(devtab[j].resources, M_TEMP);
1836         devtab[j].resources = new;
1837         devtab[j].resource_count = i + 1;
1838         return(i);
1839 }
1840
1841 static int
1842 resource_match_string(int i, const char *resname, const char *value)
1843 {
1844         int j;
1845         struct config_resource *res;
1846
1847         for (j = 0, res = devtab[i].resources;
1848              j < devtab[i].resource_count; j++, res++)
1849                 if (!strcmp(res->name, resname)
1850                     && res->type == RES_STRING
1851                     && !strcmp(res->u.stringval, value))
1852                         return(j);
1853         return(-1);
1854 }
1855
1856 static int
1857 resource_find(const char *name, int unit, const char *resname,
1858               struct config_resource **result)
1859 {
1860         int i, j;
1861         struct config_resource *res;
1862
1863         /*
1864          * First check specific instances, then generic.
1865          */
1866         for (i = 0; i < devtab_count; i++) {
1867                 if (devtab[i].unit < 0)
1868                         continue;
1869                 if (!strcmp(devtab[i].name, name) && devtab[i].unit == unit) {
1870                         res = devtab[i].resources;
1871                         for (j = 0; j < devtab[i].resource_count; j++, res++)
1872                                 if (!strcmp(res->name, resname)) {
1873                                         *result = res;
1874                                         return(0);
1875                                 }
1876                 }
1877         }
1878         for (i = 0; i < devtab_count; i++) {
1879                 if (devtab[i].unit >= 0)
1880                         continue;
1881                 /* XXX should this `&& devtab[i].unit == unit' be here? */
1882                 /* XXX if so, then the generic match does nothing */
1883                 if (!strcmp(devtab[i].name, name) && devtab[i].unit == unit) {
1884                         res = devtab[i].resources;
1885                         for (j = 0; j < devtab[i].resource_count; j++, res++)
1886                                 if (!strcmp(res->name, resname)) {
1887                                         *result = res;
1888                                         return(0);
1889                                 }
1890                 }
1891         }
1892         return(ENOENT);
1893 }
1894
1895 int
1896 resource_int_value(const char *name, int unit, const char *resname, int *result)
1897 {
1898         int error;
1899         struct config_resource *res;
1900
1901         if ((error = resource_find(name, unit, resname, &res)) != 0)
1902                 return(error);
1903         if (res->type != RES_INT)
1904                 return(EFTYPE);
1905         *result = res->u.intval;
1906         return(0);
1907 }
1908
1909 int
1910 resource_long_value(const char *name, int unit, const char *resname,
1911                     long *result)
1912 {
1913         int error;
1914         struct config_resource *res;
1915
1916         if ((error = resource_find(name, unit, resname, &res)) != 0)
1917                 return(error);
1918         if (res->type != RES_LONG)
1919                 return(EFTYPE);
1920         *result = res->u.longval;
1921         return(0);
1922 }
1923
1924 int
1925 resource_string_value(const char *name, int unit, const char *resname,
1926                       char **result)
1927 {
1928         int error;
1929         struct config_resource *res;
1930
1931         if ((error = resource_find(name, unit, resname, &res)) != 0)
1932                 return(error);
1933         if (res->type != RES_STRING)
1934                 return(EFTYPE);
1935         *result = res->u.stringval;
1936         return(0);
1937 }
1938
1939 int
1940 resource_query_string(int i, const char *resname, const char *value)
1941 {
1942         if (i < 0)
1943                 i = 0;
1944         else
1945                 i = i + 1;
1946         for (; i < devtab_count; i++)
1947                 if (resource_match_string(i, resname, value) >= 0)
1948                         return(i);
1949         return(-1);
1950 }
1951
1952 int
1953 resource_locate(int i, const char *resname)
1954 {
1955         if (i < 0)
1956                 i = 0;
1957         else
1958                 i = i + 1;
1959         for (; i < devtab_count; i++)
1960                 if (!strcmp(devtab[i].name, resname))
1961                         return(i);
1962         return(-1);
1963 }
1964
1965 int
1966 resource_count(void)
1967 {
1968         return(devtab_count);
1969 }
1970
1971 char *
1972 resource_query_name(int i)
1973 {
1974         return(devtab[i].name);
1975 }
1976
1977 int
1978 resource_query_unit(int i)
1979 {
1980         return(devtab[i].unit);
1981 }
1982
1983 static int
1984 resource_create(const char *name, int unit, const char *resname,
1985                 resource_type type, struct config_resource **result)
1986 {
1987         int i, j;
1988         struct config_resource *res = NULL;
1989
1990         for (i = 0; i < devtab_count; i++)
1991                 if (!strcmp(devtab[i].name, name) && devtab[i].unit == unit) {
1992                         res = devtab[i].resources;
1993                         break;
1994                 }
1995         if (res == NULL) {
1996                 i = resource_new_name(name, unit);
1997                 if (i < 0)
1998                         return(ENOMEM);
1999                 res = devtab[i].resources;
2000         }
2001         for (j = 0; j < devtab[i].resource_count; j++, res++)
2002                 if (!strcmp(res->name, resname)) {
2003                         *result = res;
2004                         return(0);
2005                 }
2006         j = resource_new_resname(i, resname, type);
2007         if (j < 0)
2008                 return(ENOMEM);
2009         res = &devtab[i].resources[j];
2010         *result = res;
2011         return(0);
2012 }
2013
2014 int
2015 resource_set_int(const char *name, int unit, const char *resname, int value)
2016 {
2017         int error;
2018         struct config_resource *res;
2019
2020         error = resource_create(name, unit, resname, RES_INT, &res);
2021         if (error)
2022                 return(error);
2023         if (res->type != RES_INT)
2024                 return(EFTYPE);
2025         res->u.intval = value;
2026         return(0);
2027 }
2028
2029 int
2030 resource_set_long(const char *name, int unit, const char *resname, long value)
2031 {
2032         int error;
2033         struct config_resource *res;
2034
2035         error = resource_create(name, unit, resname, RES_LONG, &res);
2036         if (error)
2037                 return(error);
2038         if (res->type != RES_LONG)
2039                 return(EFTYPE);
2040         res->u.longval = value;
2041         return(0);
2042 }
2043
2044 int
2045 resource_set_string(const char *name, int unit, const char *resname,
2046                     const char *value)
2047 {
2048         int error;
2049         struct config_resource *res;
2050
2051         error = resource_create(name, unit, resname, RES_STRING, &res);
2052         if (error)
2053                 return(error);
2054         if (res->type != RES_STRING)
2055                 return(EFTYPE);
2056         if (res->u.stringval)
2057                 kfree(res->u.stringval, M_TEMP);
2058         res->u.stringval = kmalloc(strlen(value) + 1, M_TEMP, M_INTWAIT);
2059         if (res->u.stringval == NULL)
2060                 return(ENOMEM);
2061         strcpy(res->u.stringval, value);
2062         return(0);
2063 }
2064
2065 static void
2066 resource_cfgload(void *dummy __unused)
2067 {
2068         struct config_resource *res, *cfgres;
2069         int i, j;
2070         int error;
2071         char *name, *resname;
2072         int unit;
2073         resource_type type;
2074         char *stringval;
2075         int config_devtab_count;
2076
2077         config_devtab_count = devtab_count;
2078         devtab = NULL;
2079         devtab_count = 0;
2080
2081         for (i = 0; i < config_devtab_count; i++) {
2082                 name = config_devtab[i].name;
2083                 unit = config_devtab[i].unit;
2084
2085                 for (j = 0; j < config_devtab[i].resource_count; j++) {
2086                         cfgres = config_devtab[i].resources;
2087                         resname = cfgres[j].name;
2088                         type = cfgres[j].type;
2089                         error = resource_create(name, unit, resname, type,
2090                                                 &res);
2091                         if (error) {
2092                                 kprintf("create resource %s%d: error %d\n",
2093                                         name, unit, error);
2094                                 continue;
2095                         }
2096                         if (res->type != type) {
2097                                 kprintf("type mismatch %s%d: %d != %d\n",
2098                                         name, unit, res->type, type);
2099                                 continue;
2100                         }
2101                         switch (type) {
2102                         case RES_INT:
2103                                 res->u.intval = cfgres[j].u.intval;
2104                                 break;
2105                         case RES_LONG:
2106                                 res->u.longval = cfgres[j].u.longval;
2107                                 break;
2108                         case RES_STRING:
2109                                 if (res->u.stringval)
2110                                         kfree(res->u.stringval, M_TEMP);
2111                                 stringval = cfgres[j].u.stringval;
2112                                 res->u.stringval = kmalloc(strlen(stringval) + 1,
2113                                                           M_TEMP, M_INTWAIT);
2114                                 if (res->u.stringval == NULL)
2115                                         break;
2116                                 strcpy(res->u.stringval, stringval);
2117                                 break;
2118                         default:
2119                                 panic("unknown resource type %d", type);
2120                         }
2121                 }
2122         }
2123 }
2124 SYSINIT(cfgload, SI_BOOT1_POST, SI_ORDER_ANY + 50, resource_cfgload, 0)
2125
2126
2127 /*======================================*/
2128 /*
2129  * Some useful method implementations to make life easier for bus drivers.
2130  */
2131
2132 void
2133 resource_list_init(struct resource_list *rl)
2134 {
2135         SLIST_INIT(rl);
2136 }
2137
2138 void
2139 resource_list_free(struct resource_list *rl)
2140 {
2141         struct resource_list_entry *rle;
2142
2143         while ((rle = SLIST_FIRST(rl)) != NULL) {
2144                 if (rle->res)
2145                         panic("resource_list_free: resource entry is busy");
2146                 SLIST_REMOVE_HEAD(rl, link);
2147                 kfree(rle, M_BUS);
2148         }
2149 }
2150
2151 void
2152 resource_list_add(struct resource_list *rl,
2153                   int type, int rid,
2154                   u_long start, u_long end, u_long count)
2155 {
2156         struct resource_list_entry *rle;
2157
2158         rle = resource_list_find(rl, type, rid);
2159         if (rle == NULL) {
2160                 rle = kmalloc(sizeof(struct resource_list_entry), M_BUS,
2161                              M_INTWAIT);
2162                 if (!rle)
2163                         panic("resource_list_add: can't record entry");
2164                 SLIST_INSERT_HEAD(rl, rle, link);
2165                 rle->type = type;
2166                 rle->rid = rid;
2167                 rle->res = NULL;
2168         }
2169
2170         if (rle->res)
2171                 panic("resource_list_add: resource entry is busy");
2172
2173         rle->start = start;
2174         rle->end = end;
2175         rle->count = count;
2176 }
2177
2178 struct resource_list_entry*
2179 resource_list_find(struct resource_list *rl,
2180                    int type, int rid)
2181 {
2182         struct resource_list_entry *rle;
2183
2184         SLIST_FOREACH(rle, rl, link)
2185                 if (rle->type == type && rle->rid == rid)
2186                         return(rle);
2187         return(NULL);
2188 }
2189
2190 void
2191 resource_list_delete(struct resource_list *rl,
2192                      int type, int rid)
2193 {
2194         struct resource_list_entry *rle = resource_list_find(rl, type, rid);
2195
2196         if (rle) {
2197                 if (rle->res != NULL)
2198                         panic("resource_list_delete: resource has not been released");
2199                 SLIST_REMOVE(rl, rle, resource_list_entry, link);
2200                 kfree(rle, M_BUS);
2201         }
2202 }
2203
2204 struct resource *
2205 resource_list_alloc(struct resource_list *rl,
2206                     device_t bus, device_t child,
2207                     int type, int *rid,
2208                     u_long start, u_long end,
2209                     u_long count, u_int flags)
2210 {
2211         struct resource_list_entry *rle = 0;
2212         int passthrough = (device_get_parent(child) != bus);
2213         int isdefault = (start == 0UL && end == ~0UL);
2214
2215         if (passthrough) {
2216                 return(BUS_ALLOC_RESOURCE(device_get_parent(bus), child,
2217                                           type, rid,
2218                                           start, end, count, flags));
2219         }
2220
2221         rle = resource_list_find(rl, type, *rid);
2222
2223         if (!rle)
2224                 return(0);              /* no resource of that type/rid */
2225
2226         if (rle->res)
2227                 panic("resource_list_alloc: resource entry is busy");
2228
2229         if (isdefault) {
2230                 start = rle->start;
2231                 count = max(count, rle->count);
2232                 end = max(rle->end, start + count - 1);
2233         }
2234
2235         rle->res = BUS_ALLOC_RESOURCE(device_get_parent(bus), child,
2236                                       type, rid, start, end, count, flags);
2237
2238         /*
2239          * Record the new range.
2240          */
2241         if (rle->res) {
2242                 rle->start = rman_get_start(rle->res);
2243                 rle->end = rman_get_end(rle->res);
2244                 rle->count = count;
2245         }
2246
2247         return(rle->res);
2248 }
2249
2250 int
2251 resource_list_release(struct resource_list *rl,
2252                       device_t bus, device_t child,
2253                       int type, int rid, struct resource *res)
2254 {
2255         struct resource_list_entry *rle = 0;
2256         int passthrough = (device_get_parent(child) != bus);
2257         int error;
2258
2259         if (passthrough) {
2260                 return(BUS_RELEASE_RESOURCE(device_get_parent(bus), child,
2261                                             type, rid, res));
2262         }
2263
2264         rle = resource_list_find(rl, type, rid);
2265
2266         if (!rle)
2267                 panic("resource_list_release: can't find resource");
2268         if (!rle->res)
2269                 panic("resource_list_release: resource entry is not busy");
2270
2271         error = BUS_RELEASE_RESOURCE(device_get_parent(bus), child,
2272                                      type, rid, res);
2273         if (error)
2274                 return(error);
2275
2276         rle->res = NULL;
2277         return(0);
2278 }
2279
2280 int
2281 resource_list_print_type(struct resource_list *rl, const char *name, int type,
2282                          const char *format)
2283 {
2284         struct resource_list_entry *rle;
2285         int printed, retval;
2286
2287         printed = 0;
2288         retval = 0;
2289         /* Yes, this is kinda cheating */
2290         SLIST_FOREACH(rle, rl, link) {
2291                 if (rle->type == type) {
2292                         if (printed == 0)
2293                                 retval += kprintf(" %s ", name);
2294                         else
2295                                 retval += kprintf(",");
2296                         printed++;
2297                         retval += kprintf(format, rle->start);
2298                         if (rle->count > 1) {
2299                                 retval += kprintf("-");
2300                                 retval += kprintf(format, rle->start +
2301                                                  rle->count - 1);
2302                         }
2303                 }
2304         }
2305         return(retval);
2306 }
2307
2308 /*
2309  * Generic driver/device identify functions.  These will install a device
2310  * rendezvous point under the parent using the same name as the driver
2311  * name, which will at a later time be probed and attached.
2312  *
2313  * These functions are used when the parent does not 'scan' its bus for
2314  * matching devices, or for the particular devices using these functions,
2315  * or when the device is a pseudo or synthesized device (such as can be
2316  * found under firewire and ppbus).
2317  */
2318 int
2319 bus_generic_identify(driver_t *driver, device_t parent)
2320 {
2321         if (parent->state == DS_ATTACHED)
2322                 return (0);
2323         BUS_ADD_CHILD(parent, parent, 0, driver->name, -1);
2324         return (0);
2325 }
2326
2327 int
2328 bus_generic_identify_sameunit(driver_t *driver, device_t parent)
2329 {
2330         if (parent->state == DS_ATTACHED)
2331                 return (0);
2332         BUS_ADD_CHILD(parent, parent, 0, driver->name, device_get_unit(parent));
2333         return (0);
2334 }
2335
2336 /*
2337  * Call DEVICE_IDENTIFY for each driver.
2338  */
2339 int
2340 bus_generic_probe(device_t dev)
2341 {
2342         devclass_t dc = dev->devclass;
2343         driverlink_t dl;
2344
2345         TAILQ_FOREACH(dl, &dc->drivers, link) {
2346                 DEVICE_IDENTIFY(dl->driver, dev);
2347         }
2348
2349         return(0);
2350 }
2351
2352 /*
2353  * This is an aweful hack due to the isa bus and autoconf code not
2354  * probing the ISA devices until after everything else has configured.
2355  * The ISA bus did a dummy attach long ago so we have to set it back
2356  * to an earlier state so the probe thinks its the initial probe and
2357  * not a bus rescan.
2358  *
2359  * XXX remove by properly defering the ISA bus scan.
2360  */
2361 int
2362 bus_generic_probe_hack(device_t dev)
2363 {
2364         if (dev->state == DS_ATTACHED) {
2365                 dev->state = DS_ALIVE;
2366                 bus_generic_probe(dev);
2367                 dev->state = DS_ATTACHED;
2368         }
2369         return (0);
2370 }
2371
2372 int
2373 bus_generic_attach(device_t dev)
2374 {
2375         device_t child;
2376
2377         TAILQ_FOREACH(child, &dev->children, link) {
2378                 device_probe_and_attach(child);
2379         }
2380
2381         return(0);
2382 }
2383
2384 int
2385 bus_generic_detach(device_t dev)
2386 {
2387         device_t child;
2388         int error;
2389
2390         if (dev->state != DS_ATTACHED)
2391                 return(EBUSY);
2392
2393         TAILQ_FOREACH(child, &dev->children, link)
2394                 if ((error = device_detach(child)) != 0)
2395                         return(error);
2396
2397         return 0;
2398 }
2399
2400 int
2401 bus_generic_shutdown(device_t dev)
2402 {
2403         device_t child;
2404
2405         TAILQ_FOREACH(child, &dev->children, link)
2406                 device_shutdown(child);
2407
2408         return(0);
2409 }
2410
2411 int
2412 bus_generic_suspend(device_t dev)
2413 {
2414         int error;
2415         device_t child, child2;
2416
2417         TAILQ_FOREACH(child, &dev->children, link) {
2418                 error = DEVICE_SUSPEND(child);
2419                 if (error) {
2420                         for (child2 = TAILQ_FIRST(&dev->children);
2421                              child2 && child2 != child;
2422                              child2 = TAILQ_NEXT(child2, link))
2423                                 DEVICE_RESUME(child2);
2424                         return(error);
2425                 }
2426         }
2427         return(0);
2428 }
2429
2430 int
2431 bus_generic_resume(device_t dev)
2432 {
2433         device_t child;
2434
2435         TAILQ_FOREACH(child, &dev->children, link)
2436                 DEVICE_RESUME(child);
2437                 /* if resume fails, there's nothing we can usefully do... */
2438
2439         return(0);
2440 }
2441
2442 int
2443 bus_print_child_header(device_t dev, device_t child)
2444 {
2445         int retval = 0;
2446
2447         if (device_get_desc(child))
2448                 retval += device_printf(child, "<%s>", device_get_desc(child));
2449         else
2450                 retval += kprintf("%s", device_get_nameunit(child));
2451         if (bootverbose) {
2452                 if (child->state != DS_ATTACHED)
2453                         kprintf(" [tentative]");
2454                 else
2455                         kprintf(" [attached!]");
2456         }
2457         return(retval);
2458 }
2459
2460 int
2461 bus_print_child_footer(device_t dev, device_t child)
2462 {
2463         return(kprintf(" on %s\n", device_get_nameunit(dev)));
2464 }
2465
2466 device_t
2467 bus_generic_add_child(device_t dev, device_t child, int order,
2468                       const char *name, int unit)
2469 {
2470         if (dev->parent)
2471                 dev = BUS_ADD_CHILD(dev->parent, child, order, name, unit);
2472         else
2473                 dev = device_add_child_ordered(child, order, name, unit);
2474         return(dev);
2475
2476 }
2477
2478 int
2479 bus_generic_print_child(device_t dev, device_t child)
2480 {
2481         int retval = 0;
2482
2483         retval += bus_print_child_header(dev, child);
2484         retval += bus_print_child_footer(dev, child);
2485
2486         return(retval);
2487 }
2488
2489 int
2490 bus_generic_read_ivar(device_t dev, device_t child, int index,
2491                       uintptr_t * result)
2492 {
2493         int error;
2494
2495         if (dev->parent)
2496                 error = BUS_READ_IVAR(dev->parent, child, index, result);
2497         else
2498                 error = ENOENT;
2499         return (error);
2500 }
2501
2502 int
2503 bus_generic_write_ivar(device_t dev, device_t child, int index,
2504                        uintptr_t value)
2505 {
2506         int error;
2507
2508         if (dev->parent)
2509                 error = BUS_WRITE_IVAR(dev->parent, child, index, value);
2510         else
2511                 error = ENOENT;
2512         return (error);
2513 }
2514
2515 /*
2516  * Resource list are used for iterations, do not recurse.
2517  */
2518 struct resource_list *
2519 bus_generic_get_resource_list(device_t dev, device_t child)
2520 {
2521         return (NULL);
2522 }
2523
2524 void
2525 bus_generic_driver_added(device_t dev, driver_t *driver)
2526 {
2527         device_t child;
2528
2529         DEVICE_IDENTIFY(driver, dev);
2530         TAILQ_FOREACH(child, &dev->children, link) {
2531                 if (child->state == DS_NOTPRESENT)
2532                         device_probe_and_attach(child);
2533         }
2534 }
2535
2536 int
2537 bus_generic_setup_intr(device_t dev, device_t child, struct resource *irq,
2538                        int flags, driver_intr_t *intr, void *arg,
2539                        void **cookiep, lwkt_serialize_t serializer)
2540 {
2541         /* Propagate up the bus hierarchy until someone handles it. */
2542         if (dev->parent)
2543                 return(BUS_SETUP_INTR(dev->parent, child, irq, flags,
2544                                       intr, arg, cookiep, serializer));
2545         else
2546                 return(EINVAL);
2547 }
2548
2549 int
2550 bus_generic_teardown_intr(device_t dev, device_t child, struct resource *irq,
2551                           void *cookie)
2552 {
2553         /* Propagate up the bus hierarchy until someone handles it. */
2554         if (dev->parent)
2555                 return(BUS_TEARDOWN_INTR(dev->parent, child, irq, cookie));
2556         else
2557                 return(EINVAL);
2558 }
2559
2560 int
2561 bus_generic_disable_intr(device_t dev, device_t child, void *cookie)
2562 {
2563         if (dev->parent)
2564                 return(BUS_DISABLE_INTR(dev->parent, child, cookie));
2565         else
2566                 return(0);
2567 }
2568
2569 void
2570 bus_generic_enable_intr(device_t dev, device_t child, void *cookie)
2571 {
2572         if (dev->parent)
2573                 BUS_ENABLE_INTR(dev->parent, child, cookie);
2574 }
2575
2576 int
2577 bus_generic_config_intr(device_t dev, device_t child, int irq, enum intr_trigger trig,
2578     enum intr_polarity pol)
2579 {
2580         /* Propagate up the bus hierarchy until someone handles it. */
2581         if (dev->parent)
2582                 return(BUS_CONFIG_INTR(dev->parent, child, irq, trig, pol));
2583         else
2584                 return(EINVAL);
2585 }
2586
2587 struct resource *
2588 bus_generic_alloc_resource(device_t dev, device_t child, int type, int *rid,
2589                            u_long start, u_long end, u_long count, u_int flags)
2590 {
2591         /* Propagate up the bus hierarchy until someone handles it. */
2592         if (dev->parent)
2593                 return(BUS_ALLOC_RESOURCE(dev->parent, child, type, rid,
2594                                            start, end, count, flags));
2595         else
2596                 return(NULL);
2597 }
2598
2599 int
2600 bus_generic_release_resource(device_t dev, device_t child, int type, int rid,
2601                              struct resource *r)
2602 {
2603         /* Propagate up the bus hierarchy until someone handles it. */
2604         if (dev->parent)
2605                 return(BUS_RELEASE_RESOURCE(dev->parent, child, type, rid, r));
2606         else
2607                 return(EINVAL);
2608 }
2609
2610 int
2611 bus_generic_activate_resource(device_t dev, device_t child, int type, int rid,
2612                               struct resource *r)
2613 {
2614         /* Propagate up the bus hierarchy until someone handles it. */
2615         if (dev->parent)
2616                 return(BUS_ACTIVATE_RESOURCE(dev->parent, child, type, rid, r));
2617         else
2618                 return(EINVAL);
2619 }
2620
2621 int
2622 bus_generic_deactivate_resource(device_t dev, device_t child, int type,
2623                                 int rid, struct resource *r)
2624 {
2625         /* Propagate up the bus hierarchy until someone handles it. */
2626         if (dev->parent)
2627                 return(BUS_DEACTIVATE_RESOURCE(dev->parent, child, type, rid,
2628                                                r));
2629         else
2630                 return(EINVAL);
2631 }
2632
2633 int
2634 bus_generic_get_resource(device_t dev, device_t child, int type, int rid,
2635                          u_long *startp, u_long *countp)
2636 {
2637         int error;
2638
2639         error = ENOENT;
2640         if (dev->parent) {
2641                 error = BUS_GET_RESOURCE(dev->parent, child, type, rid,
2642                                          startp, countp);
2643         }
2644         return (error);
2645 }
2646
2647 int
2648 bus_generic_set_resource(device_t dev, device_t child, int type, int rid,
2649                         u_long start, u_long count)
2650 {
2651         int error;
2652
2653         error = EINVAL;
2654         if (dev->parent) {
2655                 error = BUS_SET_RESOURCE(dev->parent, child, type, rid,
2656                                          start, count);
2657         }
2658         return (error);
2659 }
2660
2661 void
2662 bus_generic_delete_resource(device_t dev, device_t child, int type, int rid)
2663 {
2664         if (dev->parent)
2665                 BUS_DELETE_RESOURCE(dev, child, type, rid);
2666 }
2667
2668 int
2669 bus_generic_rl_get_resource(device_t dev, device_t child, int type, int rid,
2670     u_long *startp, u_long *countp)
2671 {
2672         struct resource_list *rl = NULL;
2673         struct resource_list_entry *rle = NULL;
2674
2675         rl = BUS_GET_RESOURCE_LIST(dev, child);
2676         if (!rl)
2677                 return(EINVAL);
2678
2679         rle = resource_list_find(rl, type, rid);
2680         if (!rle)
2681                 return(ENOENT);
2682
2683         if (startp)
2684                 *startp = rle->start;
2685         if (countp)
2686                 *countp = rle->count;
2687
2688         return(0);
2689 }
2690
2691 int
2692 bus_generic_rl_set_resource(device_t dev, device_t child, int type, int rid,
2693     u_long start, u_long count)
2694 {
2695         struct resource_list *rl = NULL;
2696
2697         rl = BUS_GET_RESOURCE_LIST(dev, child);
2698         if (!rl)
2699                 return(EINVAL);
2700
2701         resource_list_add(rl, type, rid, start, (start + count - 1), count);
2702
2703         return(0);
2704 }
2705
2706 void
2707 bus_generic_rl_delete_resource(device_t dev, device_t child, int type, int rid)
2708 {
2709         struct resource_list *rl = NULL;
2710
2711         rl = BUS_GET_RESOURCE_LIST(dev, child);
2712         if (!rl)
2713                 return;
2714
2715         resource_list_delete(rl, type, rid);
2716 }
2717
2718 int
2719 bus_generic_rl_release_resource(device_t dev, device_t child, int type,
2720     int rid, struct resource *r)
2721 {
2722         struct resource_list *rl = NULL;
2723
2724         rl = BUS_GET_RESOURCE_LIST(dev, child);
2725         if (!rl)
2726                 return(EINVAL);
2727
2728         return(resource_list_release(rl, dev, child, type, rid, r));
2729 }
2730
2731 struct resource *
2732 bus_generic_rl_alloc_resource(device_t dev, device_t child, int type,
2733     int *rid, u_long start, u_long end, u_long count, u_int flags)
2734 {
2735         struct resource_list *rl = NULL;
2736
2737         rl = BUS_GET_RESOURCE_LIST(dev, child);
2738         if (!rl)
2739                 return(NULL);
2740
2741         return(resource_list_alloc(rl, dev, child, type, rid,
2742             start, end, count, flags));
2743 }
2744
2745 int
2746 bus_generic_child_present(device_t bus, device_t child)
2747 {
2748         return(BUS_CHILD_PRESENT(device_get_parent(bus), bus));
2749 }
2750
2751
2752 /*
2753  * Some convenience functions to make it easier for drivers to use the
2754  * resource-management functions.  All these really do is hide the
2755  * indirection through the parent's method table, making for slightly
2756  * less-wordy code.  In the future, it might make sense for this code
2757  * to maintain some sort of a list of resources allocated by each device.
2758  */
2759 int
2760 bus_alloc_resources(device_t dev, struct resource_spec *rs,
2761     struct resource **res)
2762 {
2763         int i;
2764
2765         for (i = 0; rs[i].type != -1; i++)
2766                 res[i] = NULL;
2767         for (i = 0; rs[i].type != -1; i++) {
2768                 res[i] = bus_alloc_resource_any(dev,
2769                     rs[i].type, &rs[i].rid, rs[i].flags);
2770                 if (res[i] == NULL) {
2771                         bus_release_resources(dev, rs, res);
2772                         return (ENXIO);
2773                 }
2774         }
2775         return (0);
2776 }
2777
2778 void
2779 bus_release_resources(device_t dev, const struct resource_spec *rs,
2780     struct resource **res)
2781 {
2782         int i;
2783
2784         for (i = 0; rs[i].type != -1; i++)
2785                 if (res[i] != NULL) {
2786                         bus_release_resource(
2787                             dev, rs[i].type, rs[i].rid, res[i]);
2788                         res[i] = NULL;
2789                 }
2790 }
2791
2792 struct resource *
2793 bus_alloc_resource(device_t dev, int type, int *rid, u_long start, u_long end,
2794                    u_long count, u_int flags)
2795 {
2796         if (dev->parent == 0)
2797                 return(0);
2798         return(BUS_ALLOC_RESOURCE(dev->parent, dev, type, rid, start, end,
2799                                   count, flags));
2800 }
2801
2802 int
2803 bus_activate_resource(device_t dev, int type, int rid, struct resource *r)
2804 {
2805         if (dev->parent == 0)
2806                 return(EINVAL);
2807         return(BUS_ACTIVATE_RESOURCE(dev->parent, dev, type, rid, r));
2808 }
2809
2810 int
2811 bus_deactivate_resource(device_t dev, int type, int rid, struct resource *r)
2812 {
2813         if (dev->parent == 0)
2814                 return(EINVAL);
2815         return(BUS_DEACTIVATE_RESOURCE(dev->parent, dev, type, rid, r));
2816 }
2817
2818 int
2819 bus_release_resource(device_t dev, int type, int rid, struct resource *r)
2820 {
2821         if (dev->parent == 0)
2822                 return(EINVAL);
2823         return(BUS_RELEASE_RESOURCE(dev->parent, dev, type, rid, r));
2824 }
2825
2826 int
2827 bus_setup_intr(device_t dev, struct resource *r, int flags,
2828                driver_intr_t handler, void *arg,
2829                void **cookiep, lwkt_serialize_t serializer)
2830 {
2831         if (dev->parent == 0)
2832                 return(EINVAL);
2833         return(BUS_SETUP_INTR(dev->parent, dev, r, flags, handler, arg,
2834                               cookiep, serializer));
2835 }
2836
2837 int
2838 bus_teardown_intr(device_t dev, struct resource *r, void *cookie)
2839 {
2840         if (dev->parent == 0)
2841                 return(EINVAL);
2842         return(BUS_TEARDOWN_INTR(dev->parent, dev, r, cookie));
2843 }
2844
2845 void
2846 bus_enable_intr(device_t dev, void *cookie)
2847 {
2848         if (dev->parent)
2849                 BUS_ENABLE_INTR(dev->parent, dev, cookie);
2850 }
2851
2852 int
2853 bus_disable_intr(device_t dev, void *cookie)
2854 {
2855         if (dev->parent)
2856                 return(BUS_DISABLE_INTR(dev->parent, dev, cookie));
2857         else
2858                 return(0);
2859 }
2860
2861 int
2862 bus_set_resource(device_t dev, int type, int rid,
2863                  u_long start, u_long count)
2864 {
2865         return(BUS_SET_RESOURCE(device_get_parent(dev), dev, type, rid,
2866                                 start, count));
2867 }
2868
2869 int
2870 bus_get_resource(device_t dev, int type, int rid,
2871                  u_long *startp, u_long *countp)
2872 {
2873         return(BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid,
2874                                 startp, countp));
2875 }
2876
2877 u_long
2878 bus_get_resource_start(device_t dev, int type, int rid)
2879 {
2880         u_long start, count;
2881         int error;
2882
2883         error = BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid,
2884                                  &start, &count);
2885         if (error)
2886                 return(0);
2887         return(start);
2888 }
2889
2890 u_long
2891 bus_get_resource_count(device_t dev, int type, int rid)
2892 {
2893         u_long start, count;
2894         int error;
2895
2896         error = BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid,
2897                                  &start, &count);
2898         if (error)
2899                 return(0);
2900         return(count);
2901 }
2902
2903 void
2904 bus_delete_resource(device_t dev, int type, int rid)
2905 {
2906         BUS_DELETE_RESOURCE(device_get_parent(dev), dev, type, rid);
2907 }
2908
2909 int
2910 bus_child_present(device_t child)
2911 {
2912         return (BUS_CHILD_PRESENT(device_get_parent(child), child));
2913 }
2914
2915 int
2916 bus_child_pnpinfo_str(device_t child, char *buf, size_t buflen)
2917 {
2918         device_t parent;
2919
2920         parent = device_get_parent(child);
2921         if (parent == NULL) {
2922                 *buf = '\0';
2923                 return (0);
2924         }
2925         return (BUS_CHILD_PNPINFO_STR(parent, child, buf, buflen));
2926 }
2927
2928 int
2929 bus_child_location_str(device_t child, char *buf, size_t buflen)
2930 {
2931         device_t parent;
2932
2933         parent = device_get_parent(child);
2934         if (parent == NULL) {
2935                 *buf = '\0';
2936                 return (0);
2937         }
2938         return (BUS_CHILD_LOCATION_STR(parent, child, buf, buflen));
2939 }
2940
2941 static int
2942 root_print_child(device_t dev, device_t child)
2943 {
2944         return(0);
2945 }
2946
2947 static int
2948 root_setup_intr(device_t dev, device_t child, driver_intr_t *intr, void *arg,
2949                 void **cookiep, lwkt_serialize_t serializer)
2950 {
2951         /*
2952          * If an interrupt mapping gets to here something bad has happened.
2953          */
2954         panic("root_setup_intr");
2955 }
2956
2957 /*
2958  * If we get here, assume that the device is permanant and really is
2959  * present in the system.  Removable bus drivers are expected to intercept
2960  * this call long before it gets here.  We return -1 so that drivers that
2961  * really care can check vs -1 or some ERRNO returned higher in the food
2962  * chain.
2963  */
2964 static int
2965 root_child_present(device_t dev, device_t child)
2966 {
2967         return(-1);
2968 }
2969
2970 /*
2971  * XXX NOTE! other defaults may be set in bus_if.m
2972  */
2973 static kobj_method_t root_methods[] = {
2974         /* Device interface */
2975         KOBJMETHOD(device_shutdown,     bus_generic_shutdown),
2976         KOBJMETHOD(device_suspend,      bus_generic_suspend),
2977         KOBJMETHOD(device_resume,       bus_generic_resume),
2978
2979         /* Bus interface */
2980         KOBJMETHOD(bus_add_child,       bus_generic_add_child),
2981         KOBJMETHOD(bus_print_child,     root_print_child),
2982         KOBJMETHOD(bus_read_ivar,       bus_generic_read_ivar),
2983         KOBJMETHOD(bus_write_ivar,      bus_generic_write_ivar),
2984         KOBJMETHOD(bus_setup_intr,      root_setup_intr),
2985         KOBJMETHOD(bus_child_present,   root_child_present),
2986
2987         { 0, 0 }
2988 };
2989
2990 static driver_t root_driver = {
2991         "root",
2992         root_methods,
2993         1,                      /* no softc */
2994 };
2995
2996 device_t        root_bus;
2997 devclass_t      root_devclass;
2998
2999 static int
3000 root_bus_module_handler(module_t mod, int what, void* arg)
3001 {
3002         switch (what) {
3003         case MOD_LOAD:
3004                 TAILQ_INIT(&bus_data_devices);
3005                 root_bus = make_device(NULL, "root", 0);
3006                 root_bus->desc = "System root bus";
3007                 kobj_init((kobj_t) root_bus, (kobj_class_t) &root_driver);
3008                 root_bus->driver = &root_driver;
3009                 root_bus->state = DS_ALIVE;
3010                 root_devclass = devclass_find_internal("root", NULL, FALSE);
3011                 devinit();
3012                 return(0);
3013
3014         case MOD_SHUTDOWN:
3015                 device_shutdown(root_bus);
3016                 return(0);
3017         default:
3018                 return(0);
3019         }
3020 }
3021
3022 static moduledata_t root_bus_mod = {
3023         "rootbus",
3024         root_bus_module_handler,
3025         0
3026 };
3027 DECLARE_MODULE(rootbus, root_bus_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
3028
3029 void
3030 root_bus_configure(void)
3031 {
3032         int warncount;
3033         device_t dev;
3034
3035         PDEBUG(("."));
3036
3037         /*
3038          * handle device_identify based device attachments to the root_bus
3039          * (typically nexus).
3040          */
3041         bus_generic_probe(root_bus);
3042
3043         /*
3044          * Probe and attach the devices under root_bus.
3045          */
3046         TAILQ_FOREACH(dev, &root_bus->children, link) {
3047                 device_probe_and_attach(dev);
3048         }
3049
3050         /*
3051          * Wait for all asynchronous attaches to complete.  If we don't
3052          * our legacy ISA bus scan could steal device unit numbers or
3053          * even I/O ports.
3054          */
3055         warncount = 10;
3056         if (numasyncthreads)
3057                 kprintf("Waiting for async drivers to attach\n");
3058         while (numasyncthreads > 0) {
3059                 if (tsleep(&numasyncthreads, 0, "rootbus", hz) == EWOULDBLOCK)
3060                         --warncount;
3061                 if (warncount == 0) {
3062                         kprintf("Warning: Still waiting for %d "
3063                                 "drivers to attach\n", numasyncthreads);
3064                 } else if (warncount == -30) {
3065                         kprintf("Giving up on %d drivers\n", numasyncthreads);
3066                         break;
3067                 }
3068         }
3069         root_bus->state = DS_ATTACHED;
3070 }
3071
3072 int
3073 driver_module_handler(module_t mod, int what, void *arg)
3074 {
3075         int error;
3076         struct driver_module_data *dmd;
3077         devclass_t bus_devclass;
3078         kobj_class_t driver;
3079         const char *parentname;
3080
3081         dmd = (struct driver_module_data *)arg;
3082         bus_devclass = devclass_find_internal(dmd->dmd_busname, NULL, TRUE);
3083         error = 0;
3084
3085         switch (what) {
3086         case MOD_LOAD:
3087                 if (dmd->dmd_chainevh)
3088                         error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);
3089
3090                 driver = dmd->dmd_driver;
3091                 PDEBUG(("Loading module: driver %s on bus %s",
3092                         DRIVERNAME(driver), dmd->dmd_busname));
3093
3094                 /*
3095                  * If the driver has any base classes, make the
3096                  * devclass inherit from the devclass of the driver's
3097                  * first base class. This will allow the system to
3098                  * search for drivers in both devclasses for children
3099                  * of a device using this driver.
3100                  */
3101                 if (driver->baseclasses)
3102                         parentname = driver->baseclasses[0]->name;
3103                 else
3104                         parentname = NULL;
3105                 *dmd->dmd_devclass = devclass_find_internal(driver->name,
3106                                                             parentname, TRUE);
3107
3108                 error = devclass_add_driver(bus_devclass, driver);
3109                 if (error)
3110                         break;
3111                 break;
3112
3113         case MOD_UNLOAD:
3114                 PDEBUG(("Unloading module: driver %s from bus %s",
3115                         DRIVERNAME(dmd->dmd_driver), dmd->dmd_busname));
3116                 error = devclass_delete_driver(bus_devclass, dmd->dmd_driver);
3117
3118                 if (!error && dmd->dmd_chainevh)
3119                         error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);
3120                 break;
3121         }
3122
3123         return (error);
3124 }
3125
3126 #ifdef BUS_DEBUG
3127
3128 /*
3129  * The _short versions avoid iteration by not calling anything that prints
3130  * more than oneliners. I love oneliners.
3131  */
3132
3133 static void
3134 print_device_short(device_t dev, int indent)
3135 {
3136         if (!dev)
3137                 return;
3138
3139         indentprintf(("device %d: <%s> %sparent,%schildren,%s%s%s%s,%sivars,%ssoftc,busy=%d\n",
3140                       dev->unit, dev->desc,
3141                       (dev->parent? "":"no "),
3142                       (TAILQ_EMPTY(&dev->children)? "no ":""),
3143                       (dev->flags&DF_ENABLED? "enabled,":"disabled,"),
3144                       (dev->flags&DF_FIXEDCLASS? "fixed,":""),
3145                       (dev->flags&DF_WILDCARD? "wildcard,":""),
3146                       (dev->flags&DF_DESCMALLOCED? "descmalloced,":""),
3147                       (dev->ivars? "":"no "),
3148                       (dev->softc? "":"no "),
3149                       dev->busy));
3150 }
3151
3152 static void
3153 print_device(device_t dev, int indent)
3154 {
3155         if (!dev)
3156                 return;
3157
3158         print_device_short(dev, indent);
3159
3160         indentprintf(("Parent:\n"));
3161         print_device_short(dev->parent, indent+1);
3162         indentprintf(("Driver:\n"));
3163         print_driver_short(dev->driver, indent+1);
3164         indentprintf(("Devclass:\n"));
3165         print_devclass_short(dev->devclass, indent+1);
3166 }
3167
3168 /*
3169  * Print the device and all its children (indented).
3170  */
3171 void
3172 print_device_tree_short(device_t dev, int indent)
3173 {
3174         device_t child;
3175
3176         if (!dev)
3177                 return;
3178
3179         print_device_short(dev, indent);
3180
3181         TAILQ_FOREACH(child, &dev->children, link)
3182                 print_device_tree_short(child, indent+1);
3183 }
3184
3185 /*
3186  * Print the device and all its children (indented).
3187  */
3188 void
3189 print_device_tree(device_t dev, int indent)
3190 {
3191         device_t child;
3192
3193         if (!dev)
3194                 return;
3195
3196         print_device(dev, indent);
3197
3198         TAILQ_FOREACH(child, &dev->children, link)
3199                 print_device_tree(child, indent+1);
3200 }
3201
3202 static void
3203 print_driver_short(driver_t *driver, int indent)
3204 {
3205         if (!driver)
3206                 return;
3207
3208         indentprintf(("driver %s: softc size = %zu\n",
3209                       driver->name, driver->size));
3210 }
3211
3212 static void
3213 print_driver(driver_t *driver, int indent)
3214 {
3215         if (!driver)
3216                 return;
3217
3218         print_driver_short(driver, indent);
3219 }
3220
3221
3222 static void
3223 print_driver_list(driver_list_t drivers, int indent)
3224 {
3225         driverlink_t driver;
3226
3227         TAILQ_FOREACH(driver, &drivers, link)
3228                 print_driver(driver->driver, indent);
3229 }
3230
3231 static void
3232 print_devclass_short(devclass_t dc, int indent)
3233 {
3234         if (!dc)
3235                 return;
3236
3237         indentprintf(("devclass %s: max units = %d\n", dc->name, dc->maxunit));
3238 }
3239
3240 static void
3241 print_devclass(devclass_t dc, int indent)
3242 {
3243         int i;
3244
3245         if (!dc)
3246                 return;
3247
3248         print_devclass_short(dc, indent);
3249         indentprintf(("Drivers:\n"));
3250         print_driver_list(dc->drivers, indent+1);
3251
3252         indentprintf(("Devices:\n"));
3253         for (i = 0; i < dc->maxunit; i++)
3254                 if (dc->devices[i])
3255                         print_device(dc->devices[i], indent+1);
3256 }
3257
3258 void
3259 print_devclass_list_short(void)
3260 {
3261         devclass_t dc;
3262
3263         kprintf("Short listing of devclasses, drivers & devices:\n");
3264         TAILQ_FOREACH(dc, &devclasses, link) {
3265                 print_devclass_short(dc, 0);
3266         }
3267 }
3268
3269 void
3270 print_devclass_list(void)
3271 {
3272         devclass_t dc;
3273
3274         kprintf("Full listing of devclasses, drivers & devices:\n");
3275         TAILQ_FOREACH(dc, &devclasses, link) {
3276                 print_devclass(dc, 0);
3277         }
3278 }
3279
3280 #endif
3281
3282 /*
3283  * Check to see if a device is disabled via a disabled hint.
3284  */
3285 int
3286 resource_disabled(const char *name, int unit)
3287 {
3288         int error, value;
3289
3290         error = resource_int_value(name, unit, "disabled", &value);
3291         if (error)
3292                return(0);
3293         return(value);
3294 }
3295
3296 /*
3297  * User-space access to the device tree.
3298  *
3299  * We implement a small set of nodes:
3300  *
3301  * hw.bus                       Single integer read method to obtain the
3302  *                              current generation count.
3303  * hw.bus.devices               Reads the entire device tree in flat space.
3304  * hw.bus.rman                  Resource manager interface
3305  *
3306  * We might like to add the ability to scan devclasses and/or drivers to
3307  * determine what else is currently loaded/available.
3308  */
3309
3310 static int
3311 sysctl_bus(SYSCTL_HANDLER_ARGS)
3312 {
3313         struct u_businfo        ubus;
3314
3315         ubus.ub_version = BUS_USER_VERSION;
3316         ubus.ub_generation = bus_data_generation;
3317
3318         return (SYSCTL_OUT(req, &ubus, sizeof(ubus)));
3319 }
3320 SYSCTL_NODE(_hw_bus, OID_AUTO, info, CTLFLAG_RW, sysctl_bus,
3321     "bus-related data");
3322
3323 static int
3324 sysctl_devices(SYSCTL_HANDLER_ARGS)
3325 {
3326         int                     *name = (int *)arg1;
3327         u_int                   namelen = arg2;
3328         int                     index;
3329         struct device           *dev;
3330         struct u_device         udev;   /* XXX this is a bit big */
3331         int                     error;
3332
3333         if (namelen != 2)
3334                 return (EINVAL);
3335
3336         if (bus_data_generation_check(name[0]))
3337                 return (EINVAL);
3338
3339         index = name[1];
3340
3341         /*
3342          * Scan the list of devices, looking for the requested index.
3343          */
3344         TAILQ_FOREACH(dev, &bus_data_devices, devlink) {
3345                 if (index-- == 0)
3346                         break;
3347         }
3348         if (dev == NULL)
3349                 return (ENOENT);
3350
3351         /*
3352          * Populate the return array.
3353          */
3354         bzero(&udev, sizeof(udev));
3355         udev.dv_handle = (uintptr_t)dev;
3356         udev.dv_parent = (uintptr_t)dev->parent;
3357         if (dev->nameunit != NULL)
3358                 strlcpy(udev.dv_name, dev->nameunit, sizeof(udev.dv_name));
3359         if (dev->desc != NULL)
3360                 strlcpy(udev.dv_desc, dev->desc, sizeof(udev.dv_desc));
3361         if (dev->driver != NULL && dev->driver->name != NULL)
3362                 strlcpy(udev.dv_drivername, dev->driver->name,
3363                     sizeof(udev.dv_drivername));
3364         bus_child_pnpinfo_str(dev, udev.dv_pnpinfo, sizeof(udev.dv_pnpinfo));
3365         bus_child_location_str(dev, udev.dv_location, sizeof(udev.dv_location));
3366         udev.dv_devflags = dev->devflags;
3367         udev.dv_flags = dev->flags;
3368         udev.dv_state = dev->state;
3369         error = SYSCTL_OUT(req, &udev, sizeof(udev));
3370         return (error);
3371 }
3372
3373 SYSCTL_NODE(_hw_bus, OID_AUTO, devices, CTLFLAG_RD, sysctl_devices,
3374     "system device tree");
3375
3376 int
3377 bus_data_generation_check(int generation)
3378 {
3379         if (generation != bus_data_generation)
3380                 return (1);
3381
3382         /* XXX generate optimised lists here? */
3383         return (0);
3384 }
3385
3386 void
3387 bus_data_generation_update(void)
3388 {
3389         bus_data_generation++;
3390 }