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  */
  28
  29 #include "opt_bus.h"
  30
  31 #include <sys/param.h>
  32 #include <sys/queue.h>
  33 #include <sys/malloc.h>
  34 #include <sys/kernel.h>
  35 #include <sys/module.h>
  36 #include <sys/kobj.h>
  37 #include <sys/bus_private.h>
  38 #include <sys/sysctl.h>
  39 #include <sys/systm.h>
  40 #include <sys/bus.h>
  41 #include <sys/rman.h>
  42 #include <sys/device.h>
  43 #include <sys/lock.h>
  44 #include <sys/conf.h>
  45 #include <sys/uio.h>
  46 #include <sys/filio.h>
  47 #include <sys/event.h>
  48 #include <sys/signalvar.h>
  49
  50 #include <machine/stdarg.h>     /* for device_printf() */
  51
  52 #include <sys/thread2.h>
  53 #include <sys/mplock2.h>
  54
  55 SYSCTL_NODE(_hw, OID_AUTO, bus, CTLFLAG_RW, NULL, NULL);
  56
  57 MALLOC_DEFINE(M_BUS, "bus", "Bus data structures");
  58
  59 #ifdef BUS_DEBUG
  60 #define PDEBUG(a)       (kprintf("%s:%d: ", __func__, __LINE__), kprintf a, kprintf("\n"))
  61 #define DEVICENAME(d)   ((d)? device_get_name(d): "no device")
  62 #define DRIVERNAME(d)   ((d)? d->name : "no driver")
  63 #define DEVCLANAME(d)   ((d)? d->name : "no devclass")
  64
  65 /* Produce the indenting, indent*2 spaces plus a '.' ahead of that to
  66  * prevent syslog from deleting initial spaces
  67  */
  68 #define indentprintf(p) do { int iJ; kprintf("."); for (iJ=0; iJ<indent; iJ++) kprintf("  "); kprintf p ; } while(0)
  69
  70 static void     print_device_short(device_t dev, int indent);
  71 static void     print_device(device_t dev, int indent);
  72 void            print_device_tree_short(device_t dev, int indent);
  73 void            print_device_tree(device_t dev, int indent);
  74 static void     print_driver_short(driver_t *driver, int indent);
  75 static void     print_driver(driver_t *driver, int indent);
  76 static void     print_driver_list(driver_list_t drivers, int indent);
  77 static void     print_devclass_short(devclass_t dc, int indent);
  78 static void     print_devclass(devclass_t dc, int indent);
  79 void            print_devclass_list_short(void);
  80 void            print_devclass_list(void);
  81
  82 #else
  83 /* Make the compiler ignore the function calls */
  84 #define PDEBUG(a)                       /* nop */
  85 #define DEVICENAME(d)                   /* nop */
  86 #define DRIVERNAME(d)                   /* nop */
  87 #define DEVCLANAME(d)                   /* nop */
  88
  89 #define print_device_short(d,i)         /* nop */
  90 #define print_device(d,i)               /* nop */
  91 #define print_device_tree_short(d,i)    /* nop */
  92 #define print_device_tree(d,i)          /* nop */
  93 #define print_driver_short(d,i)         /* nop */
  94 #define print_driver(d,i)               /* nop */
  95 #define print_driver_list(d,i)          /* nop */
  96 #define print_devclass_short(d,i)       /* nop */
  97 #define print_devclass(d,i)             /* nop */
  98 #define print_devclass_list_short()     /* nop */
  99 #define print_devclass_list()           /* nop */
 100 #endif
 101
 102 static void     device_attach_async(device_t dev);
 103 static void     device_attach_thread(void *arg);
 104 static int      device_doattach(device_t dev);
 105
 106 static int do_async_attach = 0;
 107 static int numasyncthreads;
 108 TUNABLE_INT("kern.do_async_attach", &do_async_attach);
 109
 110 /*
 111  * /dev/devctl implementation
 112  */
 113
 114 /*
 115  * This design allows only one reader for /dev/devctl.  This is not desirable
 116  * in the long run, but will get a lot of hair out of this implementation.
 117  * Maybe we should make this device a clonable device.
 118  *
 119  * Also note: we specifically do not attach a device to the device_t tree
 120  * to avoid potential chicken and egg problems.  One could argue that all
 121  * of this belongs to the root node.  One could also further argue that the
 122  * sysctl interface that we have not might more properly be an ioctl
 123  * interface, but at this stage of the game, I'm not inclined to rock that
 124  * boat.
 125  *
 126  * I'm also not sure that the SIGIO support is done correctly or not, as
 127  * I copied it from a driver that had SIGIO support that likely hasn't been
 128  * tested since 3.4 or 2.2.8!
 129  */
 130
 131 static int sysctl_devctl_disable(SYSCTL_HANDLER_ARGS);
 132 static int devctl_disable = 0;
 133 TUNABLE_INT("hw.bus.devctl_disable", &devctl_disable);
 134 SYSCTL_PROC(_hw_bus, OID_AUTO, devctl_disable, CTLTYPE_INT | CTLFLAG_RW, 0, 0,
 135     sysctl_devctl_disable, "I", "devctl disable");
 136
 137 static d_open_t         devopen;
 138 static d_close_t        devclose;
 139 static d_read_t         devread;
 140 static d_ioctl_t        devioctl;
 141 static d_kqfilter_t     devkqfilter;
 142
 143 static struct dev_ops devctl_ops = {
 144         { "devctl", 0, 0 },
 145         .d_open =       devopen,
 146         .d_close =      devclose,
 147         .d_read =       devread,
 148         .d_ioctl =      devioctl,
 149         .d_kqfilter =   devkqfilter
 150 };
 151
 152 struct dev_event_info
 153 {
 154         char *dei_data;
 155         TAILQ_ENTRY(dev_event_info) dei_link;
 156 };
 157
 158 TAILQ_HEAD(devq, dev_event_info);
 159
 160 static struct dev_softc
 161 {
 162         int     inuse;
 163         int     nonblock;
 164         struct lock lock;
 165         struct kqinfo kq;
 166         struct devq devq;
 167         struct proc *async_proc;
 168 } devsoftc;
 169
 170 static void
 171 devinit(void)
 172 {
 173         make_dev(&devctl_ops, 0, UID_ROOT, GID_WHEEL, 0600, "devctl");
 174         lockinit(&devsoftc.lock, "dev mtx", 0, 0);
 175         TAILQ_INIT(&devsoftc.devq);
 176 }
 177
 178 static int
 179 devopen(struct dev_open_args *ap)
 180 {
 181         if (devsoftc.inuse)
 182                 return (EBUSY);
 183         /* move to init */
 184         devsoftc.inuse = 1;
 185         devsoftc.nonblock = 0;
 186         devsoftc.async_proc = NULL;
 187         return (0);
 188 }
 189
 190 static int
 191 devclose(struct dev_close_args *ap)
 192 {
 193         devsoftc.inuse = 0;
 194         lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 195         wakeup(&devsoftc);
 196         lockmgr(&devsoftc.lock, LK_RELEASE);
 197
 198         return (0);
 199 }
 200
 201 /*
 202  * The read channel for this device is used to report changes to
 203  * userland in realtime.  We are required to free the data as well as
 204  * the n1 object because we allocate them separately.  Also note that
 205  * we return one record at a time.  If you try to read this device a
 206  * character at a time, you will lose the rest of the data.  Listening
 207  * programs are expected to cope.
 208  */
 209 static int
 210 devread(struct dev_read_args *ap)
 211 {
 212         struct uio *uio = ap->a_uio;
 213         struct dev_event_info *n1;
 214         int rv;
 215
 216         lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 217         while (TAILQ_EMPTY(&devsoftc.devq)) {
 218                 if (devsoftc.nonblock) {
 219                         lockmgr(&devsoftc.lock, LK_RELEASE);
 220                         return (EAGAIN);
 221                 }
 222                 tsleep_interlock(&devsoftc, PCATCH);
 223                 lockmgr(&devsoftc.lock, LK_RELEASE);
 224                 rv = tsleep(&devsoftc, PCATCH | PINTERLOCKED, "devctl", 0);
 225                 lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 226                 if (rv) {
 227                         /*
 228                          * Need to translate ERESTART to EINTR here? -- jake
 229                          */
 230                         lockmgr(&devsoftc.lock, LK_RELEASE);
 231                         return (rv);
 232                 }
 233         }
 234         n1 = TAILQ_FIRST(&devsoftc.devq);
 235         TAILQ_REMOVE(&devsoftc.devq, n1, dei_link);
 236         lockmgr(&devsoftc.lock, LK_RELEASE);
 237         rv = uiomove(n1->dei_data, strlen(n1->dei_data), uio);
 238         kfree(n1->dei_data, M_BUS);
 239         kfree(n1, M_BUS);
 240         return (rv);
 241 }
 242
 243 static  int
 244 devioctl(struct dev_ioctl_args *ap)
 245 {
 246         switch (ap->a_cmd) {
 247
 248         case FIONBIO:
 249                 if (*(int*)ap->a_data)
 250                         devsoftc.nonblock = 1;
 251                 else
 252                         devsoftc.nonblock = 0;
 253                 return (0);
 254         case FIOASYNC:
 255                 if (*(int*)ap->a_data)
 256                         devsoftc.async_proc = curproc;
 257                 else
 258                         devsoftc.async_proc = NULL;
 259                 return (0);
 260
 261                 /* (un)Support for other fcntl() calls. */
 262         case FIOCLEX:
 263         case FIONCLEX:
 264         case FIONREAD:
 265         case FIOSETOWN:
 266         case FIOGETOWN:
 267         default:
 268                 break;
 269         }
 270         return (ENOTTY);
 271 }
 272
 273 static void dev_filter_detach(struct knote *);
 274 static int dev_filter_read(struct knote *, long);
 275
 276 static struct filterops dev_filtops =
 277         { FILTEROP_ISFD, NULL, dev_filter_detach, dev_filter_read };
 278
 279 static int
 280 devkqfilter(struct dev_kqfilter_args *ap)
 281 {
 282         struct knote *kn = ap->a_kn;
 283         struct klist *klist;
 284
 285         ap->a_result = 0;
 286         lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 287
 288         switch (kn->kn_filter) {
 289         case EVFILT_READ:
 290                 kn->kn_fop = &dev_filtops;
 291                 break;
 292         default:
 293                 ap->a_result = EOPNOTSUPP;
 294                 lockmgr(&devsoftc.lock, LK_RELEASE);
 295                 return (0);
 296         }
 297
 298         klist = &devsoftc.kq.ki_note;
 299         knote_insert(klist, kn);
 300
 301         lockmgr(&devsoftc.lock, LK_RELEASE);
 302
 303         return (0);
 304 }
 305
 306 static void
 307 dev_filter_detach(struct knote *kn)
 308 {
 309         struct klist *klist;
 310
 311         lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 312         klist = &devsoftc.kq.ki_note;
 313         knote_remove(klist, kn);
 314         lockmgr(&devsoftc.lock, LK_RELEASE);
 315 }
 316
 317 static int
 318 dev_filter_read(struct knote *kn, long hint)
 319 {
 320         int ready = 0;
 321
 322         lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 323         if (!TAILQ_EMPTY(&devsoftc.devq))
 324                 ready = 1;
 325         lockmgr(&devsoftc.lock, LK_RELEASE);
 326
 327         return (ready);
 328 }
 329
 330
 331 /**
 332  * @brief Return whether the userland process is running
 333  */
 334 boolean_t
 335 devctl_process_running(void)
 336 {
 337         return (devsoftc.inuse == 1);
 338 }
 339
 340 /**
 341  * @brief Queue data to be read from the devctl device
 342  *
 343  * Generic interface to queue data to the devctl device.  It is
 344  * assumed that @p data is properly formatted.  It is further assumed
 345  * that @p data is allocated using the M_BUS malloc type.
 346  */
 347 void
 348 devctl_queue_data(char *data)
 349 {
 350         struct dev_event_info *n1 = NULL;
 351         struct proc *p;
 352
 353         n1 = kmalloc(sizeof(*n1), M_BUS, M_NOWAIT);
 354         if (n1 == NULL)
 355                 return;
 356         n1->dei_data = data;
 357         lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 358         TAILQ_INSERT_TAIL(&devsoftc.devq, n1, dei_link);
 359         wakeup(&devsoftc);
 360         lockmgr(&devsoftc.lock, LK_RELEASE);
 361         get_mplock();   /* XXX */
 362         KNOTE(&devsoftc.kq.ki_note, 0);
 363         rel_mplock();   /* XXX */
 364         p = devsoftc.async_proc;
 365         if (p != NULL)
 366                 ksignal(p, SIGIO);
 367 }
 368
 369 /**
 370  * @brief Send a 'notification' to userland, using standard ways
 371  */
 372 void
 373 devctl_notify(const char *system, const char *subsystem, const char *type,
 374     const char *data)
 375 {
 376         int len = 0;
 377         char *msg;
 378
 379         if (system == NULL)
 380                 return;         /* BOGUS!  Must specify system. */
 381         if (subsystem == NULL)
 382                 return;         /* BOGUS!  Must specify subsystem. */
 383         if (type == NULL)
 384                 return;         /* BOGUS!  Must specify type. */
 385         len += strlen(" system=") + strlen(system);
 386         len += strlen(" subsystem=") + strlen(subsystem);
 387         len += strlen(" type=") + strlen(type);
 388         /* add in the data message plus newline. */
 389         if (data != NULL)
 390                 len += strlen(data);
 391         len += 3;       /* '!', '\n', and NUL */
 392         msg = kmalloc(len, M_BUS, M_NOWAIT);
 393         if (msg == NULL)
 394                 return;         /* Drop it on the floor */
 395         if (data != NULL)
 396                 ksnprintf(msg, len, "!system=%s subsystem=%s type=%s %s\n",
 397                     system, subsystem, type, data);
 398         else
 399                 ksnprintf(msg, len, "!system=%s subsystem=%s type=%s\n",
 400                     system, subsystem, type);
 401         devctl_queue_data(msg);
 402 }
 403
 404 /*
 405  * Common routine that tries to make sending messages as easy as possible.
 406  * We allocate memory for the data, copy strings into that, but do not
 407  * free it unless there's an error.  The dequeue part of the driver should
 408  * free the data.  We don't send data when the device is disabled.  We do
 409  * send data, even when we have no listeners, because we wish to avoid
 410  * races relating to startup and restart of listening applications.
 411  *
 412  * devaddq is designed to string together the type of event, with the
 413  * object of that event, plus the plug and play info and location info
 414  * for that event.  This is likely most useful for devices, but less
 415  * useful for other consumers of this interface.  Those should use
 416  * the devctl_queue_data() interface instead.
 417  */
 418 static void
 419 devaddq(const char *type, const char *what, device_t dev)
 420 {
 421         char *data = NULL;
 422         char *loc = NULL;
 423         char *pnp = NULL;
 424         const char *parstr;
 425
 426         if (devctl_disable)
 427                 return;
 428         data = kmalloc(1024, M_BUS, M_NOWAIT);
 429         if (data == NULL)
 430                 goto bad;
 431
 432         /* get the bus specific location of this device */
 433         loc = kmalloc(1024, M_BUS, M_NOWAIT);
 434         if (loc == NULL)
 435                 goto bad;
 436         *loc = '\0';
 437         bus_child_location_str(dev, loc, 1024);
 438
 439         /* Get the bus specific pnp info of this device */
 440         pnp = kmalloc(1024, M_BUS, M_NOWAIT);
 441         if (pnp == NULL)
 442                 goto bad;
 443         *pnp = '\0';
 444         bus_child_pnpinfo_str(dev, pnp, 1024);
 445
 446         /* Get the parent of this device, or / if high enough in the tree. */
 447         if (device_get_parent(dev) == NULL)
 448                 parstr = ".";   /* Or '/' ? */
 449         else
 450                 parstr = device_get_nameunit(device_get_parent(dev));
 451         /* String it all together. */
 452         ksnprintf(data, 1024, "%s%s at %s %s on %s\n", type, what, loc, pnp,
 453           parstr);
 454         kfree(loc, M_BUS);
 455         kfree(pnp, M_BUS);
 456         devctl_queue_data(data);
 457         return;
 458 bad:
 459         kfree(pnp, M_BUS);
 460         kfree(loc, M_BUS);
 461         kfree(data, M_BUS);
 462         return;
 463 }
 464
 465 /*
 466  * A device was added to the tree.  We are called just after it successfully
 467  * attaches (that is, probe and attach success for this device).  No call
 468  * is made if a device is merely parented into the tree.  See devnomatch
 469  * if probe fails.  If attach fails, no notification is sent (but maybe
 470  * we should have a different message for this).
 471  */
 472 static void
 473 devadded(device_t dev)
 474 {
 475         char *pnp = NULL;
 476         char *tmp = NULL;
 477
 478         pnp = kmalloc(1024, M_BUS, M_NOWAIT);
 479         if (pnp == NULL)
 480                 goto fail;
 481         tmp = kmalloc(1024, M_BUS, M_NOWAIT);
 482         if (tmp == NULL)
 483                 goto fail;
 484         *pnp = '\0';
 485         bus_child_pnpinfo_str(dev, pnp, 1024);
 486         ksnprintf(tmp, 1024, "%s %s", device_get_nameunit(dev), pnp);
 487         devaddq("+", tmp, dev);
 488 fail:
 489         if (pnp != NULL)
 490                 kfree(pnp, M_BUS);
 491         if (tmp != NULL)
 492                 kfree(tmp, M_BUS);
 493         return;
 494 }
 495
 496 /*
 497  * A device was removed from the tree.  We are called just before this
 498  * happens.
 499  */
 500 static void
 501 devremoved(device_t dev)
 502 {
 503         char *pnp = NULL;
 504         char *tmp = NULL;
 505
 506         pnp = kmalloc(1024, M_BUS, M_NOWAIT);
 507         if (pnp == NULL)
 508                 goto fail;
 509         tmp = kmalloc(1024, M_BUS, M_NOWAIT);
 510         if (tmp == NULL)
 511                 goto fail;
 512         *pnp = '\0';
 513         bus_child_pnpinfo_str(dev, pnp, 1024);
 514         ksnprintf(tmp, 1024, "%s %s", device_get_nameunit(dev), pnp);
 515         devaddq("-", tmp, dev);
 516 fail:
 517         if (pnp != NULL)
 518                 kfree(pnp, M_BUS);
 519         if (tmp != NULL)
 520                 kfree(tmp, M_BUS);
 521         return;
 522 }
 523
 524 /*
 525  * Called when there's no match for this device.  This is only called
 526  * the first time that no match happens, so we don't keep getitng this
 527  * message.  Should that prove to be undesirable, we can change it.
 528  * This is called when all drivers that can attach to a given bus
 529  * decline to accept this device.  Other errrors may not be detected.
 530  */
 531 static void
 532 devnomatch(device_t dev)
 533 {
 534         devaddq("?", "", dev);
 535 }
 536
 537 static int
 538 sysctl_devctl_disable(SYSCTL_HANDLER_ARGS)
 539 {
 540         struct dev_event_info *n1;
 541         int dis, error;
 542
 543         dis = devctl_disable;
 544         error = sysctl_handle_int(oidp, &dis, 0, req);
 545         if (error || !req->newptr)
 546                 return (error);
 547         lockmgr(&devsoftc.lock, LK_EXCLUSIVE);
 548         devctl_disable = dis;
 549         if (dis) {
 550                 while (!TAILQ_EMPTY(&devsoftc.devq)) {
 551                         n1 = TAILQ_FIRST(&devsoftc.devq);
 552                         TAILQ_REMOVE(&devsoftc.devq, n1, dei_link);
 553                         kfree(n1->dei_data, M_BUS);
 554                         kfree(n1, M_BUS);
 555                 }
 556         }
 557         lockmgr(&devsoftc.lock, LK_RELEASE);
 558         return (0);
 559 }
 560
 561 /* End of /dev/devctl code */
 562
 563 TAILQ_HEAD(,device)     bus_data_devices;
 564 static int bus_data_generation = 1;
 565
 566 kobj_method_t null_methods[] = {
 567         { 0, 0 }
 568 };
 569
 570 DEFINE_CLASS(null, null_methods, 0);
 571
 572 /*
 573  * Devclass implementation
 574  */
 575
 576 static devclass_list_t devclasses = TAILQ_HEAD_INITIALIZER(devclasses);
 577
 578 static devclass_t
 579 devclass_find_internal(const char *classname, const char *parentname,
 580                        int create)
 581 {
 582         devclass_t dc;
 583
 584         PDEBUG(("looking for %s", classname));
 585         if (classname == NULL)
 586                 return(NULL);
 587
 588         TAILQ_FOREACH(dc, &devclasses, link)
 589                 if (!strcmp(dc->name, classname))
 590                         break;
 591
 592         if (create && !dc) {
 593                 PDEBUG(("creating %s", classname));
 594                 dc = kmalloc(sizeof(struct devclass) + strlen(classname) + 1,
 595                             M_BUS, M_INTWAIT | M_ZERO);
 596                 if (!dc)
 597                         return(NULL);
 598                 dc->parent = NULL;
 599                 dc->name = (char*) (dc + 1);
 600                 strcpy(dc->name, classname);
 601                 dc->devices = NULL;
 602                 dc->maxunit = 0;
 603                 TAILQ_INIT(&dc->drivers);
 604                 TAILQ_INSERT_TAIL(&devclasses, dc, link);
 605
 606                 bus_data_generation_update();
 607
 608         }
 609
 610         /*
 611          * If a parent class is specified, then set that as our parent so
 612          * that this devclass will support drivers for the parent class as
 613          * well.  If the parent class has the same name don't do this though
 614          * as it creates a cycle that can trigger an infinite loop in
 615          * device_probe_child() if a device exists for which there is no
 616          * suitable driver.
 617          */
 618         if (parentname && dc && !dc->parent &&
 619             strcmp(classname, parentname) != 0)
 620                 dc->parent = devclass_find_internal(parentname, NULL, FALSE);
 621
 622         return(dc);
 623 }
 624
 625 devclass_t
 626 devclass_create(const char *classname)
 627 {
 628         return(devclass_find_internal(classname, NULL, TRUE));
 629 }
 630
 631 devclass_t
 632 devclass_find(const char *classname)
 633 {
 634         return(devclass_find_internal(classname, NULL, FALSE));
 635 }
 636
 637 device_t
 638 devclass_find_unit(const char *classname, int unit)
 639 {
 640         devclass_t dc;
 641
 642         if ((dc = devclass_find(classname)) != NULL)
 643             return(devclass_get_device(dc, unit));
 644         return (NULL);
 645 }
 646
 647 int
 648 devclass_add_driver(devclass_t dc, driver_t *driver)
 649 {
 650         driverlink_t dl;
 651         device_t dev;
 652         int i;
 653
 654         PDEBUG(("%s", DRIVERNAME(driver)));
 655
 656         dl = kmalloc(sizeof *dl, M_BUS, M_INTWAIT | M_ZERO);
 657         if (!dl)
 658                 return(ENOMEM);
 659
 660         /*
 661          * Compile the driver's methods. Also increase the reference count
 662          * so that the class doesn't get freed when the last instance
 663          * goes. This means we can safely use static methods and avoids a
 664          * double-free in devclass_delete_driver.
 665          */
 666         kobj_class_instantiate(driver);
 667
 668         /*
 669          * Make sure the devclass which the driver is implementing exists.
 670          */
 671         devclass_find_internal(driver->name, NULL, TRUE);
 672
 673         dl->driver = driver;
 674         TAILQ_INSERT_TAIL(&dc->drivers, dl, link);
 675
 676         /*
 677          * Call BUS_DRIVER_ADDED for any existing busses in this class,
 678          * but only if the bus has already been attached (otherwise we
 679          * might probe too early).
 680          *
 681          * This is what will cause a newly loaded module to be associated
 682          * with hardware.  bus_generic_driver_added() is typically what ends
 683          * up being called.
 684          */
 685         for (i = 0; i < dc->maxunit; i++) {
 686                 if ((dev = dc->devices[i]) != NULL) {
 687                         if (dev->state >= DS_ATTACHED)
 688                                 BUS_DRIVER_ADDED(dev, driver);
 689                 }
 690         }
 691
 692         bus_data_generation_update();
 693         return(0);
 694 }
 695
 696 int
 697 devclass_delete_driver(devclass_t busclass, driver_t *driver)
 698 {
 699         devclass_t dc = devclass_find(driver->name);
 700         driverlink_t dl;
 701         device_t dev;
 702         int i;
 703         int error;
 704
 705         PDEBUG(("%s from devclass %s", driver->name, DEVCLANAME(busclass)));
 706
 707         if (!dc)
 708                 return(0);
 709
 710         /*
 711          * Find the link structure in the bus' list of drivers.
 712          */
 713         TAILQ_FOREACH(dl, &busclass->drivers, link)
 714                 if (dl->driver == driver)
 715                         break;
 716
 717         if (!dl) {
 718                 PDEBUG(("%s not found in %s list", driver->name, busclass->name));
 719                 return(ENOENT);
 720         }
 721
 722         /*
 723          * Disassociate from any devices.  We iterate through all the
 724          * devices in the devclass of the driver and detach any which are
 725          * using the driver and which have a parent in the devclass which
 726          * we are deleting from.
 727          *
 728          * Note that since a driver can be in multiple devclasses, we
 729          * should not detach devices which are not children of devices in
 730          * the affected devclass.
 731          */
 732         for (i = 0; i < dc->maxunit; i++)
 733                 if (dc->devices[i]) {
 734                         dev = dc->devices[i];
 735                         if (dev->driver == driver && dev->parent &&
 736                             dev->parent->devclass == busclass) {
 737                                 if ((error = device_detach(dev)) != 0)
 738                                         return(error);
 739                                 device_set_driver(dev, NULL);
 740                         }
 741                 }
 742
 743         TAILQ_REMOVE(&busclass->drivers, dl, link);
 744         kfree(dl, M_BUS);
 745
 746         kobj_class_uninstantiate(driver);
 747
 748         bus_data_generation_update();
 749         return(0);
 750 }
 751
 752 static driverlink_t
 753 devclass_find_driver_internal(devclass_t dc, const char *classname)
 754 {
 755         driverlink_t dl;
 756
 757         PDEBUG(("%s in devclass %s", classname, DEVCLANAME(dc)));
 758
 759         TAILQ_FOREACH(dl, &dc->drivers, link)
 760                 if (!strcmp(dl->driver->name, classname))
 761                         return(dl);
 762
 763         PDEBUG(("not found"));
 764         return(NULL);
 765 }
 766
 767 kobj_class_t
 768 devclass_find_driver(devclass_t dc, const char *classname)
 769 {
 770         driverlink_t dl;
 771
 772         dl = devclass_find_driver_internal(dc, classname);
 773         if (dl)
 774                 return(dl->driver);
 775         else
 776                 return(NULL);
 777 }
 778
 779 const char *
 780 devclass_get_name(devclass_t dc)
 781 {
 782         return(dc->name);
 783 }
 784
 785 device_t
 786 devclass_get_device(devclass_t dc, int unit)
 787 {
 788         if (dc == NULL || unit < 0 || unit >= dc->maxunit)
 789                 return(NULL);
 790         return(dc->devices[unit]);
 791 }
 792
 793 void *
 794 devclass_get_softc(devclass_t dc, int unit)
 795 {
 796         device_t dev;
 797
 798         dev = devclass_get_device(dc, unit);
 799         if (!dev)
 800                 return(NULL);
 801
 802         return(device_get_softc(dev));
 803 }
 804
 805 int
 806 devclass_get_devices(devclass_t dc, device_t **devlistp, int *devcountp)
 807 {
 808         int i;
 809         int count;
 810         device_t *list;
 811
 812         count = 0;
 813         for (i = 0; i < dc->maxunit; i++)
 814                 if (dc->devices[i])
 815                         count++;
 816
 817         list = kmalloc(count * sizeof(device_t), M_TEMP, M_INTWAIT | M_ZERO);
 818         if (list == NULL)
 819                 return(ENOMEM);
 820
 821         count = 0;
 822         for (i = 0; i < dc->maxunit; i++)
 823                 if (dc->devices[i]) {
 824                         list[count] = dc->devices[i];
 825                         count++;
 826                 }
 827
 828         *devlistp = list;
 829         *devcountp = count;
 830
 831         return(0);
 832 }
 833
 834 /**
 835  * @brief Get a list of drivers in the devclass
 836  *
 837  * An array containing a list of pointers to all the drivers in the
 838  * given devclass is allocated and returned in @p *listp.  The number
 839  * of drivers in the array is returned in @p *countp. The caller should
 840  * free the array using @c free(p, M_TEMP).
 841  *
 842  * @param dc            the devclass to examine
 843  * @param listp         gives location for array pointer return value
 844  * @param countp        gives location for number of array elements
 845  *                      return value
 846  *
 847  * @retval 0            success
 848  * @retval ENOMEM       the array allocation failed
 849  */
 850 int
 851 devclass_get_drivers(devclass_t dc, driver_t ***listp, int *countp)
 852 {
 853         driverlink_t dl;
 854         driver_t **list;
 855         int count;
 856
 857         count = 0;
 858         TAILQ_FOREACH(dl, &dc->drivers, link)
 859                 count++;
 860         list = kmalloc(count * sizeof(driver_t *), M_TEMP, M_NOWAIT);
 861         if (list == NULL)
 862                 return (ENOMEM);
 863
 864         count = 0;
 865         TAILQ_FOREACH(dl, &dc->drivers, link) {
 866                 list[count] = dl->driver;
 867                 count++;
 868         }
 869         *listp = list;
 870         *countp = count;
 871
 872         return (0);
 873 }
 874
 875 /**
 876  * @brief Get the number of devices in a devclass
 877  *
 878  * @param dc            the devclass to examine
 879  */
 880 int
 881 devclass_get_count(devclass_t dc)
 882 {
 883         int count, i;
 884
 885         count = 0;
 886         for (i = 0; i < dc->maxunit; i++)
 887                 if (dc->devices[i])
 888                         count++;
 889         return (count);
 890 }
 891
 892 int
 893 devclass_get_maxunit(devclass_t dc)
 894 {
 895         return(dc->maxunit);
 896 }
 897
 898 void
 899 devclass_set_parent(devclass_t dc, devclass_t pdc)
 900 {
 901         dc->parent = pdc;
 902 }
 903
 904 devclass_t
 905 devclass_get_parent(devclass_t dc)
 906 {
 907         return(dc->parent);
 908 }
 909
 910 static int
 911 devclass_alloc_unit(devclass_t dc, int *unitp)
 912 {
 913         int unit = *unitp;
 914
 915         PDEBUG(("unit %d in devclass %s", unit, DEVCLANAME(dc)));
 916
 917         /* If we have been given a wired unit number, check for existing device */
 918         if (unit != -1) {
 919                 if (unit >= 0 && unit < dc->maxunit &&
 920                     dc->devices[unit] != NULL) {
 921                         if (bootverbose)
 922                                 kprintf("%s-: %s%d exists, using next available unit number\n",
 923                                        dc->name, dc->name, unit);
 924                         /* find the next available slot */
 925                         while (++unit < dc->maxunit && dc->devices[unit] != NULL)
 926                                 ;
 927                 }
 928         } else {
 929                 /* Unwired device, find the next available slot for it */
 930                 unit = 0;
 931                 while (unit < dc->maxunit && dc->devices[unit] != NULL)
 932                         unit++;
 933         }
 934
 935         /*
 936          * We've selected a unit beyond the length of the table, so let's
 937          * extend the table to make room for all units up to and including
 938          * this one.
 939          */
 940         if (unit >= dc->maxunit) {
 941                 device_t *newlist;
 942                 int newsize;
 943
 944                 newsize = roundup((unit + 1), MINALLOCSIZE / sizeof(device_t));
 945                 newlist = kmalloc(sizeof(device_t) * newsize, M_BUS,
 946                                  M_INTWAIT | M_ZERO);
 947                 if (newlist == NULL)
 948                         return(ENOMEM);
 949                 bcopy(dc->devices, newlist, sizeof(device_t) * dc->maxunit);
 950                 if (dc->devices)
 951                         kfree(dc->devices, M_BUS);
 952                 dc->devices = newlist;
 953                 dc->maxunit = newsize;
 954         }
 955         PDEBUG(("now: unit %d in devclass %s", unit, DEVCLANAME(dc)));
 956
 957         *unitp = unit;
 958         return(0);
 959 }
 960
 961 static int
 962 devclass_add_device(devclass_t dc, device_t dev)
 963 {
 964         int buflen, error;
 965
 966         PDEBUG(("%s in devclass %s", DEVICENAME(dev), DEVCLANAME(dc)));
 967
 968         buflen = strlen(dc->name) + 5;
 969         dev->nameunit = kmalloc(buflen, M_BUS, M_INTWAIT | M_ZERO);
 970         if (!dev->nameunit)
 971                 return(ENOMEM);
 972
 973         if ((error = devclass_alloc_unit(dc, &dev->unit)) != 0) {
 974                 kfree(dev->nameunit, M_BUS);
 975                 dev->nameunit = NULL;
 976                 return(error);
 977         }
 978         dc->devices[dev->unit] = dev;
 979         dev->devclass = dc;
 980         ksnprintf(dev->nameunit, buflen, "%s%d", dc->name, dev->unit);
 981
 982         return(0);
 983 }
 984
 985 static int
 986 devclass_delete_device(devclass_t dc, device_t dev)
 987 {
 988         if (!dc || !dev)
 989                 return(0);
 990
 991         PDEBUG(("%s in devclass %s", DEVICENAME(dev), DEVCLANAME(dc)));
 992
 993         if (dev->devclass != dc || dc->devices[dev->unit] != dev)
 994                 panic("devclass_delete_device: inconsistent device class");
 995         dc->devices[dev->unit] = NULL;
 996         if (dev->flags & DF_WILDCARD)
 997                 dev->unit = -1;
 998         dev->devclass = NULL;
 999         kfree(dev->nameunit, M_BUS);
1000         dev->nameunit = NULL;
1001
1002         return(0);
1003 }
1004
1005 static device_t
1006 make_device(device_t parent, const char *name, int unit)
1007 {
1008         device_t dev;
1009         devclass_t dc;
1010
1011         PDEBUG(("%s at %s as unit %d", name, DEVICENAME(parent), unit));
1012
1013         if (name != NULL) {
1014                 dc = devclass_find_internal(name, NULL, TRUE);
1015                 if (!dc) {
1016                         kprintf("make_device: can't find device class %s\n", name);
1017                         return(NULL);
1018                 }
1019         } else
1020                 dc = NULL;
1021
1022         dev = kmalloc(sizeof(struct device), M_BUS, M_INTWAIT | M_ZERO);
1023         if (!dev)
1024                 return(0);
1025
1026         dev->parent = parent;
1027         TAILQ_INIT(&dev->children);
1028         kobj_init((kobj_t) dev, &null_class);
1029         dev->driver = NULL;
1030         dev->devclass = NULL;
1031         dev->unit = unit;
1032         dev->nameunit = NULL;
1033         dev->desc = NULL;
1034         dev->busy = 0;
1035         dev->devflags = 0;
1036         dev->flags = DF_ENABLED;
1037         dev->order = 0;
1038         if (unit == -1)
1039                 dev->flags |= DF_WILDCARD;
1040         if (name) {
1041                 dev->flags |= DF_FIXEDCLASS;
1042                 if (devclass_add_device(dc, dev) != 0) {
1043                         kobj_delete((kobj_t)dev, M_BUS);
1044                         return(NULL);
1045                 }
1046         }
1047         dev->ivars = NULL;
1048         dev->softc = NULL;
1049
1050         dev->state = DS_NOTPRESENT;
1051
1052         TAILQ_INSERT_TAIL(&bus_data_devices, dev, devlink);
1053         bus_data_generation_update();
1054
1055         return(dev);
1056 }
1057
1058 static int
1059 device_print_child(device_t dev, device_t child)
1060 {
1061         int retval = 0;
1062
1063         if (device_is_alive(child))
1064                 retval += BUS_PRINT_CHILD(dev, child);
1065         else
1066                 retval += device_printf(child, " not found\n");
1067
1068         return(retval);
1069 }
1070
1071 device_t
1072 device_add_child(device_t dev, const char *name, int unit)
1073 {
1074         return device_add_child_ordered(dev, 0, name, unit);
1075 }
1076
1077 device_t
1078 device_add_child_ordered(device_t dev, int order, const char *name, int unit)
1079 {
1080         device_t child;
1081         device_t place;
1082
1083         PDEBUG(("%s at %s with order %d as unit %d", name, DEVICENAME(dev),
1084                 order, unit));
1085
1086         child = make_device(dev, name, unit);
1087         if (child == NULL)
1088                 return child;
1089         child->order = order;
1090
1091         TAILQ_FOREACH(place, &dev->children, link)
1092                 if (place->order > order)
1093                         break;
1094
1095         if (place) {
1096                 /*
1097                  * The device 'place' is the first device whose order is
1098                  * greater than the new child.
1099                  */
1100                 TAILQ_INSERT_BEFORE(place, child, link);
1101         } else {
1102                 /*
1103                  * The new child's order is greater or equal to the order of
1104                  * any existing device. Add the child to the tail of the list.
1105                  */
1106                 TAILQ_INSERT_TAIL(&dev->children, child, link);
1107         }
1108
1109         bus_data_generation_update();
1110         return(child);
1111 }
1112
1113 int
1114 device_delete_child(device_t dev, device_t child)
1115 {
1116         int error;
1117         device_t grandchild;
1118
1119         PDEBUG(("%s from %s", DEVICENAME(child), DEVICENAME(dev)));
1120
1121         /* remove children first */
1122         while ( (grandchild = TAILQ_FIRST(&child->children)) ) {
1123                 error = device_delete_child(child, grandchild);
1124                 if (error)
1125                         return(error);
1126         }
1127
1128         if ((error = device_detach(child)) != 0)
1129                 return(error);
1130         if (child->devclass)
1131                 devclass_delete_device(child->devclass, child);
1132         TAILQ_REMOVE(&dev->children, child, link);
1133         TAILQ_REMOVE(&bus_data_devices, child, devlink);
1134         device_set_desc(child, NULL);
1135         kobj_delete((kobj_t)child, M_BUS);
1136
1137         bus_data_generation_update();
1138         return(0);
1139 }
1140
1141 /**
1142  * @brief Find a device given a unit number
1143  *
1144  * This is similar to devclass_get_devices() but only searches for
1145  * devices which have @p dev as a parent.
1146  *
1147  * @param dev           the parent device to search
1148  * @param unit          the unit number to search for.  If the unit is -1,
1149  *                      return the first child of @p dev which has name
1150  *                      @p classname (that is, the one with the lowest unit.)
1151  *
1152  * @returns             the device with the given unit number or @c
1153  *                      NULL if there is no such device
1154  */
1155 device_t
1156 device_find_child(device_t dev, const char *classname, int unit)
1157 {
1158         devclass_t dc;
1159         device_t child;
1160
1161         dc = devclass_find(classname);
1162         if (!dc)
1163                 return(NULL);
1164
1165         if (unit != -1) {
1166                 child = devclass_get_device(dc, unit);
1167                 if (child && child->parent == dev)
1168                         return (child);
1169         } else {
1170                 for (unit = 0; unit < devclass_get_maxunit(dc); unit++) {
1171                         child = devclass_get_device(dc, unit);
1172                         if (child && child->parent == dev)
1173                                 return (child);
1174                 }
1175         }
1176         return(NULL);
1177 }
1178
1179 static driverlink_t
1180 first_matching_driver(devclass_t dc, device_t dev)
1181 {
1182         if (dev->devclass)
1183                 return(devclass_find_driver_internal(dc, dev->devclass->name));
1184         else
1185                 return(TAILQ_FIRST(&dc->drivers));
1186 }
1187
1188 static driverlink_t
1189 next_matching_driver(devclass_t dc, device_t dev, driverlink_t last)
1190 {
1191         if (dev->devclass) {
1192                 driverlink_t dl;
1193                 for (dl = TAILQ_NEXT(last, link); dl; dl = TAILQ_NEXT(dl, link))
1194                         if (!strcmp(dev->devclass->name, dl->driver->name))
1195                                 return(dl);
1196                 return(NULL);
1197         } else
1198                 return(TAILQ_NEXT(last, link));
1199 }
1200
1201 static int
1202 device_probe_child(device_t dev, device_t child)
1203 {
1204         devclass_t dc;
1205         driverlink_t best = 0;
1206         driverlink_t dl;
1207         int result, pri = 0;
1208         int hasclass = (child->devclass != 0);
1209
1210         dc = dev->devclass;
1211         if (!dc)
1212                 panic("device_probe_child: parent device has no devclass");
1213
1214         if (child->state == DS_ALIVE)
1215                 return(0);
1216
1217         for (; dc; dc = dc->parent) {
1218                 for (dl = first_matching_driver(dc, child); dl;
1219                      dl = next_matching_driver(dc, child, dl)) {
1220                         PDEBUG(("Trying %s", DRIVERNAME(dl->driver)));
1221                         device_set_driver(child, dl->driver);
1222                         if (!hasclass)
1223                                 device_set_devclass(child, dl->driver->name);
1224                         result = DEVICE_PROBE(child);
1225                         if (!hasclass)
1226                                 device_set_devclass(child, 0);
1227
1228                         /*
1229                          * If the driver returns SUCCESS, there can be
1230                          * no higher match for this device.
1231                          */
1232                         if (result == 0) {
1233                                 best = dl;
1234                                 pri = 0;
1235                                 break;
1236                         }
1237
1238                         /*
1239                          * The driver returned an error so it
1240                          * certainly doesn't match.
1241                          */
1242                         if (result > 0) {
1243                                 device_set_driver(child, 0);
1244                                 continue;
1245                         }
1246
1247                         /*
1248                          * A priority lower than SUCCESS, remember the
1249                          * best matching driver. Initialise the value
1250                          * of pri for the first match.
1251                          */
1252                         if (best == 0 || result > pri) {
1253                                 best = dl;
1254                                 pri = result;
1255                                 continue;
1256                         }
1257                 }
1258                 /*
1259                  * If we have unambiguous match in this devclass,
1260                  * don't look in the parent.
1261                  */
1262                 if (best && pri == 0)
1263                         break;
1264         }
1265
1266         /*
1267          * If we found a driver, change state and initialise the devclass.
1268          */
1269         if (best) {
1270                 if (!child->devclass)
1271                         device_set_devclass(child, best->driver->name);
1272                 device_set_driver(child, best->driver);
1273                 if (pri < 0) {
1274                         /*
1275                          * A bit bogus. Call the probe method again to make
1276                          * sure that we have the right description.
1277                          */
1278                         DEVICE_PROBE(child);
1279                 }
1280
1281                 bus_data_generation_update();
1282                 child->state = DS_ALIVE;
1283                 return(0);
1284         }
1285
1286         return(ENXIO);
1287 }
1288
1289 device_t
1290 device_get_parent(device_t dev)
1291 {
1292         return dev->parent;
1293 }
1294
1295 int
1296 device_get_children(device_t dev, device_t **devlistp, int *devcountp)
1297 {
1298         int count;
1299         device_t child;
1300         device_t *list;
1301
1302         count = 0;
1303         TAILQ_FOREACH(child, &dev->children, link)
1304                 count++;
1305
1306         list = kmalloc(count * sizeof(device_t), M_TEMP, M_INTWAIT | M_ZERO);
1307         if (!list)
1308                 return(ENOMEM);
1309
1310         count = 0;
1311         TAILQ_FOREACH(child, &dev->children, link) {
1312                 list[count] = child;
1313                 count++;
1314         }
1315
1316         *devlistp = list;
1317         *devcountp = count;
1318
1319         return(0);
1320 }
1321
1322 driver_t *
1323 device_get_driver(device_t dev)
1324 {
1325         return(dev->driver);
1326 }
1327
1328 devclass_t
1329 device_get_devclass(device_t dev)
1330 {
1331         return(dev->devclass);
1332 }
1333
1334 const char *
1335 device_get_name(device_t dev)
1336 {
1337         if (dev->devclass)
1338                 return devclass_get_name(dev->devclass);
1339         return(NULL);
1340 }
1341
1342 const char *
1343 device_get_nameunit(device_t dev)
1344 {
1345         return(dev->nameunit);
1346 }
1347
1348 int
1349 device_get_unit(device_t dev)
1350 {
1351         return(dev->unit);
1352 }
1353
1354 const char *
1355 device_get_desc(device_t dev)
1356 {
1357         return(dev->desc);
1358 }
1359
1360 uint32_t
1361 device_get_flags(device_t dev)
1362 {
1363         return(dev->devflags);
1364 }
1365
1366 int
1367 device_print_prettyname(device_t dev)
1368 {
1369         const char *name = device_get_name(dev);
1370
1371         if (name == 0)
1372                 return kprintf("unknown: ");
1373         else
1374                 return kprintf("%s%d: ", name, device_get_unit(dev));
1375 }
1376
1377 int
1378 device_printf(device_t dev, const char * fmt, ...)
1379 {
1380         __va_list ap;
1381         int retval;
1382
1383         retval = device_print_prettyname(dev);
1384         __va_start(ap, fmt);
1385         retval += kvprintf(fmt, ap);
1386         __va_end(ap);
1387         return retval;
1388 }
1389
1390 static void
1391 device_set_desc_internal(device_t dev, const char* desc, int copy)
1392 {
1393         if (dev->desc && (dev->flags & DF_DESCMALLOCED)) {
1394                 kfree(dev->desc, M_BUS);
1395                 dev->flags &= ~DF_DESCMALLOCED;
1396                 dev->desc = NULL;
1397         }
1398
1399         if (copy && desc) {
1400                 dev->desc = kmalloc(strlen(desc) + 1, M_BUS, M_INTWAIT);
1401                 if (dev->desc) {
1402                         strcpy(dev->desc, desc);
1403                         dev->flags |= DF_DESCMALLOCED;
1404                 }
1405         } else {
1406                 /* Avoid a -Wcast-qual warning */
1407                 dev->desc = (char *)(uintptr_t) desc;
1408         }
1409
1410         bus_data_generation_update();
1411 }
1412
1413 void
1414 device_set_desc(device_t dev, const char* desc)
1415 {
1416         device_set_desc_internal(dev, desc, FALSE);
1417 }
1418
1419 void
1420 device_set_desc_copy(device_t dev, const char* desc)
1421 {
1422         device_set_desc_internal(dev, desc, TRUE);
1423 }
1424
1425 void
1426 device_set_flags(device_t dev, uint32_t flags)
1427 {
1428         dev->devflags = flags;
1429 }
1430
1431 void *
1432 device_get_softc(device_t dev)
1433 {
1434         return dev->softc;
1435 }
1436
1437 void
1438 device_set_softc(device_t dev, void *softc)
1439 {
1440         if (dev->softc && !(dev->flags & DF_EXTERNALSOFTC))
1441                 kfree(dev->softc, M_BUS);
1442         dev->softc = softc;
1443         if (dev->softc)
1444                 dev->flags |= DF_EXTERNALSOFTC;
1445         else
1446                 dev->flags &= ~DF_EXTERNALSOFTC;
1447 }
1448
1449 void
1450 device_set_async_attach(device_t dev, int enable)
1451 {
1452         if (enable)
1453                 dev->flags |= DF_ASYNCPROBE;
1454         else
1455                 dev->flags &= ~DF_ASYNCPROBE;
1456 }
1457
1458 void *
1459 device_get_ivars(device_t dev)
1460 {
1461         return dev->ivars;
1462 }
1463
1464 void
1465 device_set_ivars(device_t dev, void * ivars)
1466 {
1467         if (!dev)
1468                 return;
1469
1470         dev->ivars = ivars;
1471 }
1472
1473 device_state_t
1474 device_get_state(device_t dev)
1475 {
1476         return(dev->state);
1477 }
1478
1479 void
1480 device_enable(device_t dev)
1481 {
1482         dev->flags |= DF_ENABLED;
1483 }
1484
1485 void
1486 device_disable(device_t dev)
1487 {
1488         dev->flags &= ~DF_ENABLED;
1489 }
1490
1491 /*
1492  * YYY cannot block
1493  */
1494 void
1495 device_busy(device_t dev)
1496 {
1497         if (dev->state < DS_ATTACHED)
1498                 panic("device_busy: called for unattached device");
1499         if (dev->busy == 0 && dev->parent)
1500                 device_busy(dev->parent);
1501         dev->busy++;
1502         dev->state = DS_BUSY;
1503 }
1504
1505 /*
1506  * YYY cannot block
1507  */
1508 void
1509 device_unbusy(device_t dev)
1510 {
1511         if (dev->state != DS_BUSY)
1512                 panic("device_unbusy: called for non-busy device");
1513         dev->busy--;
1514         if (dev->busy == 0) {
1515                 if (dev->parent)
1516                         device_unbusy(dev->parent);
1517                 dev->state = DS_ATTACHED;
1518         }
1519 }
1520
1521 void
1522 device_quiet(device_t dev)
1523 {
1524         dev->flags |= DF_QUIET;
1525 }
1526
1527 void
1528 device_verbose(device_t dev)
1529 {
1530         dev->flags &= ~DF_QUIET;
1531 }
1532
1533 int
1534 device_is_quiet(device_t dev)
1535 {
1536         return((dev->flags & DF_QUIET) != 0);
1537 }
1538
1539 int
1540 device_is_enabled(device_t dev)
1541 {
1542         return((dev->flags & DF_ENABLED) != 0);
1543 }
1544
1545 int
1546 device_is_alive(device_t dev)
1547 {
1548         return(dev->state >= DS_ALIVE);
1549 }
1550
1551 int
1552 device_is_attached(device_t dev)
1553 {
1554         return(dev->state >= DS_ATTACHED);
1555 }
1556
1557 int
1558 device_set_devclass(device_t dev, const char *classname)
1559 {
1560         devclass_t dc;
1561         int error;
1562
1563         if (!classname) {
1564                 if (dev->devclass)
1565                         devclass_delete_device(dev->devclass, dev);
1566                 return(0);
1567         }
1568
1569         if (dev->devclass) {
1570                 kprintf("device_set_devclass: device class already set\n");
1571                 return(EINVAL);
1572         }
1573
1574         dc = devclass_find_internal(classname, NULL, TRUE);
1575         if (!dc)
1576                 return(ENOMEM);
1577
1578         error = devclass_add_device(dc, dev);
1579
1580         bus_data_generation_update();
1581         return(error);
1582 }
1583
1584 int
1585 device_set_driver(device_t dev, driver_t *driver)
1586 {
1587         if (dev->state >= DS_ATTACHED)
1588                 return(EBUSY);
1589
1590         if (dev->driver == driver)
1591                 return(0);
1592
1593         if (dev->softc && !(dev->flags & DF_EXTERNALSOFTC)) {
1594                 kfree(dev->softc, M_BUS);
1595                 dev->softc = NULL;
1596         }
1597         kobj_delete((kobj_t) dev, 0);
1598         dev->driver = driver;
1599         if (driver) {
1600                 kobj_init((kobj_t) dev, (kobj_class_t) driver);
1601                 if (!(dev->flags & DF_EXTERNALSOFTC)) {
1602                         dev->softc = kmalloc(driver->size, M_BUS,
1603                                             M_INTWAIT | M_ZERO);
1604                         if (!dev->softc) {
1605                                 kobj_delete((kobj_t)dev, 0);
1606                                 kobj_init((kobj_t) dev, &null_class);
1607                                 dev->driver = NULL;
1608                                 return(ENOMEM);
1609                         }
1610                 }
1611         } else {
1612                 kobj_init((kobj_t) dev, &null_class);
1613         }
1614
1615         bus_data_generation_update();
1616         return(0);
1617 }
1618
1619 int
1620 device_probe_and_attach(device_t dev)
1621 {
1622         device_t bus = dev->parent;
1623         int error = 0;
1624
1625         if (dev->state >= DS_ALIVE)
1626                 return(0);
1627
1628         if ((dev->flags & DF_ENABLED) == 0) {
1629                 if (bootverbose) {
1630                         device_print_prettyname(dev);
1631                         kprintf("not probed (disabled)\n");
1632                 }
1633                 return(0);
1634         }
1635
1636         error = device_probe_child(bus, dev);
1637         if (error) {
1638                 if (!(dev->flags & DF_DONENOMATCH)) {
1639                         BUS_PROBE_NOMATCH(bus, dev);
1640                         devnomatch(dev);
1641                         dev->flags |= DF_DONENOMATCH;
1642                 }
1643                 return(error);
1644         }
1645
1646         /*
1647          * Output the exact device chain prior to the attach in case the
1648          * system locks up during attach, and generate the full info after
1649          * the attach so correct irq and other information is displayed.
1650          */
1651         if (bootverbose && !device_is_quiet(dev)) {
1652                 device_t tmp;
1653
1654                 kprintf("%s", device_get_nameunit(dev));
1655                 for (tmp = dev->parent; tmp; tmp = tmp->parent)
1656                         kprintf(".%s", device_get_nameunit(tmp));
1657                 kprintf("\n");
1658         }
1659         if (!device_is_quiet(dev))
1660                 device_print_child(bus, dev);
1661         if ((dev->flags & DF_ASYNCPROBE) && do_async_attach) {
1662                 kprintf("%s: probing asynchronously\n",
1663                         device_get_nameunit(dev));
1664                 dev->state = DS_INPROGRESS;
1665                 device_attach_async(dev);
1666                 error = 0;
1667         } else {
1668                 error = device_doattach(dev);
1669         }
1670         return(error);
1671 }
1672
1673 /*
1674  * Device is known to be alive, do the attach asynchronously.
1675  * However, serialize the attaches with the mp lock.
1676  */
1677 static void
1678 device_attach_async(device_t dev)
1679 {
1680         thread_t td;
1681
1682         atomic_add_int(&numasyncthreads, 1);
1683         lwkt_create(device_attach_thread, dev, &td, NULL,
1684                     0, 0, (dev->desc ? dev->desc : "devattach"));
1685 }
1686
1687 static void
1688 device_attach_thread(void *arg)
1689 {
1690         device_t dev = arg;
1691
1692         get_mplock();   /* XXX replace with devattach_token later */
1693         (void)device_doattach(dev);
1694         atomic_subtract_int(&numasyncthreads, 1);
1695         wakeup(&numasyncthreads);
1696         rel_mplock();   /* XXX replace with devattach_token later */
1697 }
1698
1699 /*
1700  * Device is known to be alive, do the attach (synchronous or asynchronous)
1701  */
1702 static int
1703 device_doattach(device_t dev)
1704 {
1705         device_t bus = dev->parent;
1706         int hasclass = (dev->devclass != 0);
1707         int error;
1708
1709         error = DEVICE_ATTACH(dev);
1710         if (error == 0) {
1711                 dev->state = DS_ATTACHED;
1712                 if (bootverbose && !device_is_quiet(dev))
1713                         device_print_child(bus, dev);
1714                 devadded(dev);
1715         } else {
1716                 kprintf("device_probe_and_attach: %s%d attach returned %d\n",
1717                        dev->driver->name, dev->unit, error);
1718                 /* Unset the class that was set in device_probe_child */
1719                 if (!hasclass)
1720                         device_set_devclass(dev, 0);
1721                 device_set_driver(dev, NULL);
1722                 dev->state = DS_NOTPRESENT;
1723         }
1724         return(error);
1725 }
1726
1727 int
1728 device_detach(device_t dev)
1729 {
1730         int error;
1731
1732         PDEBUG(("%s", DEVICENAME(dev)));
1733         if (dev->state == DS_BUSY)
1734                 return(EBUSY);
1735         if (dev->state != DS_ATTACHED)
1736                 return(0);
1737
1738         if ((error = DEVICE_DETACH(dev)) != 0)
1739                 return(error);
1740         devremoved(dev);
1741         device_printf(dev, "detached\n");
1742         if (dev->parent)
1743                 BUS_CHILD_DETACHED(dev->parent, dev);
1744
1745         if (!(dev->flags & DF_FIXEDCLASS))
1746                 devclass_delete_device(dev->devclass, dev);
1747
1748         dev->state = DS_NOTPRESENT;
1749         device_set_driver(dev, NULL);
1750
1751         return(0);
1752 }
1753
1754 int
1755 device_shutdown(device_t dev)
1756 {
1757         if (dev->state < DS_ATTACHED)
1758                 return 0;
1759         PDEBUG(("%s", DEVICENAME(dev)));
1760         return DEVICE_SHUTDOWN(dev);
1761 }
1762
1763 int
1764 device_set_unit(device_t dev, int unit)
1765 {
1766         devclass_t dc;
1767         int err;
1768
1769         dc = device_get_devclass(dev);
1770         if (unit < dc->maxunit && dc->devices[unit])
1771                 return(EBUSY);
1772         err = devclass_delete_device(dc, dev);
1773         if (err)
1774                 return(err);
1775         dev->unit = unit;
1776         err = devclass_add_device(dc, dev);
1777         if (err)
1778                 return(err);
1779
1780         bus_data_generation_update();
1781         return(0);
1782 }
1783
1784 /*======================================*/
1785 /*
1786  * Access functions for device resources.
1787  */
1788
1789 /* Supplied by config(8) in ioconf.c */
1790 extern struct config_device config_devtab[];
1791 extern int devtab_count;
1792
1793 /* Runtime version */
1794 struct config_device *devtab = config_devtab;
1795
1796 static int
1797 resource_new_name(const char *name, int unit)
1798 {
1799         struct config_device *new;
1800
1801         new = kmalloc((devtab_count + 1) * sizeof(*new), M_TEMP,
1802                      M_INTWAIT | M_ZERO);
1803         if (new == NULL)
1804                 return(-1);
1805         if (devtab && devtab_count > 0)
1806                 bcopy(devtab, new, devtab_count * sizeof(*new));
1807         new[devtab_count].name = kmalloc(strlen(name) + 1, M_TEMP, M_INTWAIT);
1808         if (new[devtab_count].name == NULL) {
1809                 kfree(new, M_TEMP);
1810                 return(-1);
1811         }
1812         strcpy(new[devtab_count].name, name);
1813         new[devtab_count].unit = unit;
1814         new[devtab_count].resource_count = 0;
1815         new[devtab_count].resources = NULL;
1816         if (devtab && devtab != config_devtab)
1817                 kfree(devtab, M_TEMP);
1818         devtab = new;
1819         return devtab_count++;
1820 }
1821
1822 static int
1823 resource_new_resname(int j, const char *resname, resource_type type)
1824 {
1825         struct config_resource *new;
1826         int i;
1827
1828         i = devtab[j].resource_count;
1829         new = kmalloc((i + 1) * sizeof(*new), M_TEMP, M_INTWAIT | M_ZERO);
1830         if (new == NULL)
1831                 return(-1);
1832         if (devtab[j].resources && i > 0)
1833                 bcopy(devtab[j].resources, new, i * sizeof(*new));
1834         new[i].name = kmalloc(strlen(resname) + 1, M_TEMP, M_INTWAIT);
1835         if (new[i].name == NULL) {
1836                 kfree(new, M_TEMP);
1837                 return(-1);
1838         }
1839         strcpy(new[i].name, resname);
1840         new[i].type = type;
1841         if (devtab[j].resources)
1842                 kfree(devtab[j].resources, M_TEMP);
1843         devtab[j].resources = new;
1844         devtab[j].resource_count = i + 1;
1845         return(i);
1846 }
1847
1848 static int
1849 resource_match_string(int i, const char *resname, const char *value)
1850 {
1851         int j;
1852         struct config_resource *res;
1853
1854         for (j = 0, res = devtab[i].resources;
1855              j < devtab[i].resource_count; j++, res++)
1856                 if (!strcmp(res->name, resname)
1857                     && res->type == RES_STRING
1858                     && !strcmp(res->u.stringval, value))
1859                         return(j);
1860         return(-1);
1861 }
1862
1863 static int
1864 resource_find(const char *name, int unit, const char *resname,
1865               struct config_resource **result)
1866 {
1867         int i, j;
1868         struct config_resource *res;
1869
1870         /*
1871          * First check specific instances, then generic.
1872          */
1873         for (i = 0; i < devtab_count; i++) {
1874                 if (devtab[i].unit < 0)
1875                         continue;
1876                 if (!strcmp(devtab[i].name, name) && devtab[i].unit == unit) {
1877                         res = devtab[i].resources;
1878                         for (j = 0; j < devtab[i].resource_count; j++, res++)
1879                                 if (!strcmp(res->name, resname)) {
1880                                         *result = res;
1881                                         return(0);
1882                                 }
1883                 }
1884         }
1885         for (i = 0; i < devtab_count; i++) {
1886                 if (devtab[i].unit >= 0)
1887                         continue;
1888                 /* XXX should this `&& devtab[i].unit == unit' be here? */
1889                 /* XXX if so, then the generic match does nothing */
1890                 if (!strcmp(devtab[i].name, name) && devtab[i].unit == unit) {
1891                         res = devtab[i].resources;
1892                         for (j = 0; j < devtab[i].resource_count; j++, res++)
1893                                 if (!strcmp(res->name, resname)) {
1894                                         *result = res;
1895                                         return(0);
1896                                 }
1897                 }
1898         }
1899         return(ENOENT);
1900 }
1901
1902 int
1903 resource_int_value(const char *name, int unit, const char *resname, int *result)
1904 {
1905         int error;
1906         struct config_resource *res;
1907
1908         if ((error = resource_find(name, unit, resname, &res)) != 0)
1909                 return(error);
1910         if (res->type != RES_INT)
1911                 return(EFTYPE);
1912         *result = res->u.intval;
1913         return(0);
1914 }
1915
1916 int
1917 resource_long_value(const char *name, int unit, const char *resname,
1918                     long *result)
1919 {
1920         int error;
1921         struct config_resource *res;
1922
1923         if ((error = resource_find(name, unit, resname, &res)) != 0)
1924                 return(error);
1925         if (res->type != RES_LONG)
1926                 return(EFTYPE);
1927         *result = res->u.longval;
1928         return(0);
1929 }
1930
1931 int
1932 resource_string_value(const char *name, int unit, const char *resname,
1933                       char **result)
1934 {
1935         int error;
1936         struct config_resource *res;
1937
1938         if ((error = resource_find(name, unit, resname, &res)) != 0)
1939                 return(error);
1940         if (res->type != RES_STRING)
1941                 return(EFTYPE);
1942         *result = res->u.stringval;
1943         return(0);
1944 }
1945
1946 int
1947 resource_query_string(int i, const char *resname, const char *value)
1948 {
1949         if (i < 0)
1950                 i = 0;
1951         else
1952                 i = i + 1;
1953         for (; i < devtab_count; i++)
1954                 if (resource_match_string(i, resname, value) >= 0)
1955                         return(i);
1956         return(-1);
1957 }
1958
1959 int
1960 resource_locate(int i, const char *resname)
1961 {
1962         if (i < 0)
1963                 i = 0;
1964         else
1965                 i = i + 1;
1966         for (; i < devtab_count; i++)
1967                 if (!strcmp(devtab[i].name, resname))
1968                         return(i);
1969         return(-1);
1970 }
1971
1972 int
1973 resource_count(void)
1974 {
1975         return(devtab_count);
1976 }
1977
1978 char *
1979 resource_query_name(int i)
1980 {
1981         return(devtab[i].name);
1982 }
1983
1984 int
1985 resource_query_unit(int i)
1986 {
1987         return(devtab[i].unit);
1988 }
1989
1990 static int
1991 resource_create(const char *name, int unit, const char *resname,
1992                 resource_type type, struct config_resource **result)
1993 {
1994         int i, j;
1995         struct config_resource *res = NULL;
1996
1997         for (i = 0; i < devtab_count; i++)
1998                 if (!strcmp(devtab[i].name, name) && devtab[i].unit == unit) {
1999                         res = devtab[i].resources;
2000                         break;
2001                 }
2002         if (res == NULL) {
2003                 i = resource_new_name(name, unit);
2004                 if (i < 0)
2005                         return(ENOMEM);
2006                 res = devtab[i].resources;
2007         }
2008         for (j = 0; j < devtab[i].resource_count; j++, res++)
2009                 if (!strcmp(res->name, resname)) {
2010                         *result = res;
2011                         return(0);
2012                 }
2013         j = resource_new_resname(i, resname, type);
2014         if (j < 0)
2015                 return(ENOMEM);
2016         res = &devtab[i].resources[j];
2017         *result = res;
2018         return(0);
2019 }
2020
2021 int
2022 resource_set_int(const char *name, int unit, const char *resname, int value)
2023 {
2024         int error;
2025         struct config_resource *res;
2026
2027         error = resource_create(name, unit, resname, RES_INT, &res);
2028         if (error)
2029                 return(error);
2030         if (res->type != RES_INT)
2031                 return(EFTYPE);
2032         res->u.intval = value;
2033         return(0);
2034 }
2035
2036 int
2037 resource_set_long(const char *name, int unit, const char *resname, long value)
2038 {
2039         int error;
2040         struct config_resource *res;
2041
2042         error = resource_create(name, unit, resname, RES_LONG, &res);
2043         if (error)
2044                 return(error);
2045         if (res->type != RES_LONG)
2046                 return(EFTYPE);
2047         res->u.longval = value;
2048         return(0);
2049 }
2050
2051 int
2052 resource_set_string(const char *name, int unit, const char *resname,
2053                     const char *value)
2054 {
2055         int error;
2056         struct config_resource *res;
2057
2058         error = resource_create(name, unit, resname, RES_STRING, &res);
2059         if (error)
2060                 return(error);
2061         if (res->type != RES_STRING)
2062                 return(EFTYPE);
2063         if (res->u.stringval)
2064                 kfree(res->u.stringval, M_TEMP);
2065         res->u.stringval = kmalloc(strlen(value) + 1, M_TEMP, M_INTWAIT);
2066         if (res->u.stringval == NULL)
2067                 return(ENOMEM);
2068         strcpy(res->u.stringval, value);
2069         return(0);
2070 }
2071
2072 static void
2073 resource_cfgload(void *dummy __unused)
2074 {
2075         struct config_resource *res, *cfgres;
2076         int i, j;
2077         int error;
2078         char *name, *resname;
2079         int unit;
2080         resource_type type;
2081         char *stringval;
2082         int config_devtab_count;
2083
2084         config_devtab_count = devtab_count;
2085         devtab = NULL;
2086         devtab_count = 0;
2087
2088         for (i = 0; i < config_devtab_count; i++) {
2089                 name = config_devtab[i].name;
2090                 unit = config_devtab[i].unit;
2091
2092                 for (j = 0; j < config_devtab[i].resource_count; j++) {
2093                         cfgres = config_devtab[i].resources;
2094                         resname = cfgres[j].name;
2095                         type = cfgres[j].type;
2096                         error = resource_create(name, unit, resname, type,
2097                                                 &res);
2098                         if (error) {
2099                                 kprintf("create resource %s%d: error %d\n",
2100                                         name, unit, error);
2101                                 continue;
2102                         }
2103                         if (res->type != type) {
2104                                 kprintf("type mismatch %s%d: %d != %d\n",
2105                                         name, unit, res->type, type);
2106                                 continue;
2107                         }
2108                         switch (type) {
2109                         case RES_INT:
2110                                 res->u.intval = cfgres[j].u.intval;
2111                                 break;
2112                         case RES_LONG:
2113                                 res->u.longval = cfgres[j].u.longval;
2114                                 break;
2115                         case RES_STRING:
2116                                 if (res->u.stringval)
2117                                         kfree(res->u.stringval, M_TEMP);
2118                                 stringval = cfgres[j].u.stringval;
2119                                 res->u.stringval = kmalloc(strlen(stringval) + 1,
2120                                                           M_TEMP, M_INTWAIT);
2121                                 if (res->u.stringval == NULL)
2122                                         break;
2123                                 strcpy(res->u.stringval, stringval);
2124                                 break;
2125                         default:
2126                                 panic("unknown resource type %d", type);
2127                         }
2128                 }
2129         }
2130 }
2131 SYSINIT(cfgload, SI_BOOT1_POST, SI_ORDER_ANY + 50, resource_cfgload, 0)
2132
2133
2134 /*======================================*/
2135 /*
2136  * Some useful method implementations to make life easier for bus drivers.
2137  */
2138
2139 void
2140 resource_list_init(struct resource_list *rl)
2141 {
2142         SLIST_INIT(rl);
2143 }
2144
2145 void
2146 resource_list_free(struct resource_list *rl)
2147 {
2148         struct resource_list_entry *rle;
2149
2150         while ((rle = SLIST_FIRST(rl)) != NULL) {
2151                 if (rle->res)
2152                         panic("resource_list_free: resource entry is busy");
2153                 SLIST_REMOVE_HEAD(rl, link);
2154                 kfree(rle, M_BUS);
2155         }
2156 }
2157
2158 void
2159 resource_list_add(struct resource_list *rl,
2160                   int type, int rid,
2161                   u_long start, u_long end, u_long count)
2162 {
2163         struct resource_list_entry *rle;
2164
2165         rle = resource_list_find(rl, type, rid);
2166         if (rle == NULL) {
2167                 rle = kmalloc(sizeof(struct resource_list_entry), M_BUS,
2168                              M_INTWAIT);
2169                 if (!rle)
2170                         panic("resource_list_add: can't record entry");
2171                 SLIST_INSERT_HEAD(rl, rle, link);
2172                 rle->type = type;
2173                 rle->rid = rid;
2174                 rle->res = NULL;
2175         }
2176
2177         if (rle->res)
2178                 panic("resource_list_add: resource entry is busy");
2179
2180         rle->start = start;
2181         rle->end = end;
2182         rle->count = count;
2183 }
2184
2185 struct resource_list_entry*
2186 resource_list_find(struct resource_list *rl,
2187                    int type, int rid)
2188 {
2189         struct resource_list_entry *rle;
2190
2191         SLIST_FOREACH(rle, rl, link)
2192                 if (rle->type == type && rle->rid == rid)
2193                         return(rle);
2194         return(NULL);
2195 }
2196
2197 void
2198 resource_list_delete(struct resource_list *rl,
2199                      int type, int rid)
2200 {
2201         struct resource_list_entry *rle = resource_list_find(rl, type, rid);
2202
2203         if (rle) {
2204                 if (rle->res != NULL)
2205                         panic("resource_list_delete: resource has not been released");
2206                 SLIST_REMOVE(rl, rle, resource_list_entry, link);
2207                 kfree(rle, M_BUS);
2208         }
2209 }
2210
2211 struct resource *
2212 resource_list_alloc(struct resource_list *rl,
2213                     device_t bus, device_t child,
2214                     int type, int *rid,
2215                     u_long start, u_long end,
2216                     u_long count, u_int flags)
2217 {
2218         struct resource_list_entry *rle = 0;
2219         int passthrough = (device_get_parent(child) != bus);
2220         int isdefault = (start == 0UL && end == ~0UL);
2221
2222         if (passthrough) {
2223                 return(BUS_ALLOC_RESOURCE(device_get_parent(bus), child,
2224                                           type, rid,
2225                                           start, end, count, flags));
2226         }
2227
2228         rle = resource_list_find(rl, type, *rid);
2229
2230         if (!rle)
2231                 return(0);              /* no resource of that type/rid */
2232
2233         if (rle->res)
2234                 panic("resource_list_alloc: resource entry is busy");
2235
2236         if (isdefault) {
2237                 start = rle->start;
2238                 count = max(count, rle->count);
2239                 end = max(rle->end, start + count - 1);
2240         }
2241
2242         rle->res = BUS_ALLOC_RESOURCE(device_get_parent(bus), child,
2243                                       type, rid, start, end, count, flags);
2244
2245         /*
2246          * Record the new range.
2247          */
2248         if (rle->res) {
2249                 rle->start = rman_get_start(rle->res);
2250                 rle->end = rman_get_end(rle->res);
2251                 rle->count = count;
2252         }
2253
2254         return(rle->res);
2255 }
2256
2257 int
2258 resource_list_release(struct resource_list *rl,
2259                       device_t bus, device_t child,
2260                       int type, int rid, struct resource *res)
2261 {
2262         struct resource_list_entry *rle = 0;
2263         int passthrough = (device_get_parent(child) != bus);
2264         int error;
2265
2266         if (passthrough) {
2267                 return(BUS_RELEASE_RESOURCE(device_get_parent(bus), child,
2268                                             type, rid, res));
2269         }
2270
2271         rle = resource_list_find(rl, type, rid);
2272
2273         if (!rle)
2274                 panic("resource_list_release: can't find resource");
2275         if (!rle->res)
2276                 panic("resource_list_release: resource entry is not busy");
2277
2278         error = BUS_RELEASE_RESOURCE(device_get_parent(bus), child,
2279                                      type, rid, res);
2280         if (error)
2281                 return(error);
2282
2283         rle->res = NULL;
2284         return(0);
2285 }
2286
2287 int
2288 resource_list_print_type(struct resource_list *rl, const char *name, int type,
2289                          const char *format)
2290 {
2291         struct resource_list_entry *rle;
2292         int printed, retval;
2293
2294         printed = 0;
2295         retval = 0;
2296         /* Yes, this is kinda cheating */
2297         SLIST_FOREACH(rle, rl, link) {
2298                 if (rle->type == type) {
2299                         if (printed == 0)
2300                                 retval += kprintf(" %s ", name);
2301                         else
2302                                 retval += kprintf(",");
2303                         printed++;
2304                         retval += kprintf(format, rle->start);
2305                         if (rle->count > 1) {
2306                                 retval += kprintf("-");
2307                                 retval += kprintf(format, rle->start +
2308                                                  rle->count - 1);
2309                         }
2310                 }
2311         }
2312         return(retval);
2313 }
2314
2315 /*
2316  * Generic driver/device identify functions.  These will install a device
2317  * rendezvous point under the parent using the same name as the driver
2318  * name, which will at a later time be probed and attached.
2319  *
2320  * These functions are used when the parent does not 'scan' its bus for
2321  * matching devices, or for the particular devices using these functions,
2322  * or when the device is a pseudo or synthesized device (such as can be
2323  * found under firewire and ppbus).
2324  */
2325 int
2326 bus_generic_identify(driver_t *driver, device_t parent)
2327 {
2328         if (parent->state == DS_ATTACHED)
2329                 return (0);
2330         BUS_ADD_CHILD(parent, parent, 0, driver->name, -1);
2331         return (0);
2332 }
2333
2334 int
2335 bus_generic_identify_sameunit(driver_t *driver, device_t parent)
2336 {
2337         if (parent->state == DS_ATTACHED)
2338                 return (0);
2339         BUS_ADD_CHILD(parent, parent, 0, driver->name, device_get_unit(parent));
2340         return (0);
2341 }
2342
2343 /*
2344  * Call DEVICE_IDENTIFY for each driver.
2345  */
2346 int
2347 bus_generic_probe(device_t dev)
2348 {
2349         devclass_t dc = dev->devclass;
2350         driverlink_t dl;
2351
2352         TAILQ_FOREACH(dl, &dc->drivers, link) {
2353                 DEVICE_IDENTIFY(dl->driver, dev);
2354         }
2355
2356         return(0);
2357 }
2358
2359 /*
2360  * This is an aweful hack due to the isa bus and autoconf code not
2361  * probing the ISA devices until after everything else has configured.
2362  * The ISA bus did a dummy attach long ago so we have to set it back
2363  * to an earlier state so the probe thinks its the initial probe and
2364  * not a bus rescan.
2365  *
2366  * XXX remove by properly defering the ISA bus scan.
2367  */
2368 int
2369 bus_generic_probe_hack(device_t dev)
2370 {
2371         if (dev->state == DS_ATTACHED) {
2372                 dev->state = DS_ALIVE;
2373                 bus_generic_probe(dev);
2374                 dev->state = DS_ATTACHED;
2375         }
2376         return (0);
2377 }
2378
2379 int
2380 bus_generic_attach(device_t dev)
2381 {
2382         device_t child;
2383
2384         TAILQ_FOREACH(child, &dev->children, link) {
2385                 device_probe_and_attach(child);
2386         }
2387
2388         return(0);
2389 }
2390
2391 int
2392 bus_generic_detach(device_t dev)
2393 {
2394         device_t child;
2395         int error;
2396
2397         if (dev->state != DS_ATTACHED)
2398                 return(EBUSY);
2399
2400         TAILQ_FOREACH(child, &dev->children, link)
2401                 if ((error = device_detach(child)) != 0)
2402                         return(error);
2403
2404         return 0;
2405 }
2406
2407 int
2408 bus_generic_shutdown(device_t dev)
2409 {
2410         device_t child;
2411
2412         TAILQ_FOREACH(child, &dev->children, link)
2413                 device_shutdown(child);
2414
2415         return(0);
2416 }
2417
2418 int
2419 bus_generic_suspend(device_t dev)
2420 {
2421         int error;
2422         device_t child, child2;
2423
2424         TAILQ_FOREACH(child, &dev->children, link) {
2425                 error = DEVICE_SUSPEND(child);
2426                 if (error) {
2427                         for (child2 = TAILQ_FIRST(&dev->children);
2428                              child2 && child2 != child;
2429                              child2 = TAILQ_NEXT(child2, link))
2430                                 DEVICE_RESUME(child2);
2431                         return(error);
2432                 }
2433         }
2434         return(0);
2435 }
2436
2437 int
2438 bus_generic_resume(device_t dev)
2439 {
2440         device_t child;
2441
2442         TAILQ_FOREACH(child, &dev->children, link)
2443                 DEVICE_RESUME(child);
2444                 /* if resume fails, there's nothing we can usefully do... */
2445
2446         return(0);
2447 }
2448
2449 int
2450 bus_print_child_header(device_t dev, device_t child)
2451 {
2452         int retval = 0;
2453
2454         if (device_get_desc(child))
2455                 retval += device_printf(child, "<%s>", device_get_desc(child));
2456         else
2457                 retval += kprintf("%s", device_get_nameunit(child));
2458         if (bootverbose) {
2459                 if (child->state != DS_ATTACHED)
2460                         kprintf(" [tentative]");
2461                 else
2462                         kprintf(" [attached!]");
2463         }
2464         return(retval);
2465 }
2466
2467 int
2468 bus_print_child_footer(device_t dev, device_t child)
2469 {
2470         return(kprintf(" on %s\n", device_get_nameunit(dev)));
2471 }
2472
2473 device_t
2474 bus_generic_add_child(device_t dev, device_t child, int order,
2475                       const char *name, int unit)
2476 {
2477         if (dev->parent)
2478                 dev = BUS_ADD_CHILD(dev->parent, child, order, name, unit);
2479         else
2480                 dev = device_add_child_ordered(child, order, name, unit);
2481         return(dev);
2482
2483 }
2484
2485 int
2486 bus_generic_print_child(device_t dev, device_t child)
2487 {
2488         int retval = 0;
2489
2490         retval += bus_print_child_header(dev, child);
2491         retval += bus_print_child_footer(dev, child);
2492
2493         return(retval);
2494 }
2495
2496 int
2497 bus_generic_read_ivar(device_t dev, device_t child, int index,
2498                       uintptr_t * result)
2499 {
2500         int error;
2501
2502         if (dev->parent)
2503                 error = BUS_READ_IVAR(dev->parent, child, index, result);
2504         else
2505                 error = ENOENT;
2506         return (error);
2507 }
2508
2509 int
2510 bus_generic_write_ivar(device_t dev, device_t child, int index,
2511                        uintptr_t value)
2512 {
2513         int error;
2514
2515         if (dev->parent)
2516                 error = BUS_WRITE_IVAR(dev->parent, child, index, value);
2517         else
2518                 error = ENOENT;
2519         return (error);
2520 }
2521
2522 /*
2523  * Resource list are used for iterations, do not recurse.
2524  */
2525 struct resource_list *
2526 bus_generic_get_resource_list(device_t dev, device_t child)
2527 {
2528         return (NULL);
2529 }
2530
2531 void
2532 bus_generic_driver_added(device_t dev, driver_t *driver)
2533 {
2534         device_t child;
2535
2536         DEVICE_IDENTIFY(driver, dev);
2537         TAILQ_FOREACH(child, &dev->children, link) {
2538                 if (child->state == DS_NOTPRESENT)
2539                         device_probe_and_attach(child);
2540         }
2541 }
2542
2543 int
2544 bus_generic_setup_intr(device_t dev, device_t child, struct resource *irq,
2545                        int flags, driver_intr_t *intr, void *arg,
2546                        void **cookiep, lwkt_serialize_t serializer)
2547 {
2548         /* Propagate up the bus hierarchy until someone handles it. */
2549         if (dev->parent)
2550                 return(BUS_SETUP_INTR(dev->parent, child, irq, flags,
2551                                       intr, arg, cookiep, serializer));
2552         else
2553                 return(EINVAL);
2554 }
2555
2556 int
2557 bus_generic_teardown_intr(device_t dev, device_t child, struct resource *irq,
2558                           void *cookie)
2559 {
2560         /* Propagate up the bus hierarchy until someone handles it. */
2561         if (dev->parent)
2562                 return(BUS_TEARDOWN_INTR(dev->parent, child, irq, cookie));
2563         else
2564                 return(EINVAL);
2565 }
2566
2567 int
2568 bus_generic_disable_intr(device_t dev, device_t child, void *cookie)
2569 {
2570         if (dev->parent)
2571                 return(BUS_DISABLE_INTR(dev->parent, child, cookie));
2572         else
2573                 return(0);
2574 }
2575
2576 void
2577 bus_generic_enable_intr(device_t dev, device_t child, void *cookie)
2578 {
2579         if (dev->parent)
2580                 BUS_ENABLE_INTR(dev->parent, child, cookie);
2581 }
2582
2583 int
2584 bus_generic_config_intr(device_t dev, device_t child, int irq, enum intr_trigger trig,
2585     enum intr_polarity pol)
2586 {
2587         /* Propagate up the bus hierarchy until someone handles it. */
2588         if (dev->parent)
2589                 return(BUS_CONFIG_INTR(dev->parent, child, irq, trig, pol));
2590         else
2591                 return(EINVAL);
2592 }
2593
2594 struct resource *
2595 bus_generic_alloc_resource(device_t dev, device_t child, int type, int *rid,
2596                            u_long start, u_long end, u_long count, u_int flags)
2597 {
2598         /* Propagate up the bus hierarchy until someone handles it. */
2599         if (dev->parent)
2600                 return(BUS_ALLOC_RESOURCE(dev->parent, child, type, rid,
2601                                            start, end, count, flags));
2602         else
2603                 return(NULL);
2604 }
2605
2606 int
2607 bus_generic_release_resource(device_t dev, device_t child, int type, int rid,
2608                              struct resource *r)
2609 {
2610         /* Propagate up the bus hierarchy until someone handles it. */
2611         if (dev->parent)
2612                 return(BUS_RELEASE_RESOURCE(dev->parent, child, type, rid, r));
2613         else
2614                 return(EINVAL);
2615 }
2616
2617 int
2618 bus_generic_activate_resource(device_t dev, device_t child, int type, int rid,
2619                               struct resource *r)
2620 {
2621         /* Propagate up the bus hierarchy until someone handles it. */
2622         if (dev->parent)
2623                 return(BUS_ACTIVATE_RESOURCE(dev->parent, child, type, rid, r));
2624         else
2625                 return(EINVAL);
2626 }
2627
2628 int
2629 bus_generic_deactivate_resource(device_t dev, device_t child, int type,
2630                                 int rid, struct resource *r)
2631 {
2632         /* Propagate up the bus hierarchy until someone handles it. */
2633         if (dev->parent)
2634                 return(BUS_DEACTIVATE_RESOURCE(dev->parent, child, type, rid,
2635                                                r));
2636         else
2637                 return(EINVAL);
2638 }
2639
2640 int
2641 bus_generic_get_resource(device_t dev, device_t child, int type, int rid,
2642                          u_long *startp, u_long *countp)
2643 {
2644         int error;
2645
2646         error = ENOENT;
2647         if (dev->parent) {
2648                 error = BUS_GET_RESOURCE(dev->parent, child, type, rid,
2649                                          startp, countp);
2650         }
2651         return (error);
2652 }
2653
2654 int
2655 bus_generic_set_resource(device_t dev, device_t child, int type, int rid,
2656                         u_long start, u_long count)
2657 {
2658         int error;
2659
2660         error = EINVAL;
2661         if (dev->parent) {
2662                 error = BUS_SET_RESOURCE(dev->parent, child, type, rid,
2663                                          start, count);
2664         }
2665         return (error);
2666 }
2667
2668 void
2669 bus_generic_delete_resource(device_t dev, device_t child, int type, int rid)
2670 {
2671         if (dev->parent)
2672                 BUS_DELETE_RESOURCE(dev, child, type, rid);
2673 }
2674
2675 int
2676 bus_generic_rl_get_resource(device_t dev, device_t child, int type, int rid,
2677     u_long *startp, u_long *countp)
2678 {
2679         struct resource_list *rl = NULL;
2680         struct resource_list_entry *rle = NULL;
2681
2682         rl = BUS_GET_RESOURCE_LIST(dev, child);
2683         if (!rl)
2684                 return(EINVAL);
2685
2686         rle = resource_list_find(rl, type, rid);
2687         if (!rle)
2688                 return(ENOENT);
2689
2690         if (startp)
2691                 *startp = rle->start;
2692         if (countp)
2693                 *countp = rle->count;
2694
2695         return(0);
2696 }
2697
2698 int
2699 bus_generic_rl_set_resource(device_t dev, device_t child, int type, int rid,
2700     u_long start, u_long count)
2701 {
2702         struct resource_list *rl = NULL;
2703
2704         rl = BUS_GET_RESOURCE_LIST(dev, child);
2705         if (!rl)
2706                 return(EINVAL);
2707
2708         resource_list_add(rl, type, rid, start, (start + count - 1), count);
2709
2710         return(0);
2711 }
2712
2713 void
2714 bus_generic_rl_delete_resource(device_t dev, device_t child, int type, int rid)
2715 {
2716         struct resource_list *rl = NULL;
2717
2718         rl = BUS_GET_RESOURCE_LIST(dev, child);
2719         if (!rl)
2720                 return;
2721
2722         resource_list_delete(rl, type, rid);
2723 }
2724
2725 int
2726 bus_generic_rl_release_resource(device_t dev, device_t child, int type,
2727     int rid, struct resource *r)
2728 {
2729         struct resource_list *rl = NULL;
2730
2731         rl = BUS_GET_RESOURCE_LIST(dev, child);
2732         if (!rl)
2733                 return(EINVAL);
2734
2735         return(resource_list_release(rl, dev, child, type, rid, r));
2736 }
2737
2738 struct resource *
2739 bus_generic_rl_alloc_resource(device_t dev, device_t child, int type,
2740     int *rid, u_long start, u_long end, u_long count, u_int flags)
2741 {
2742         struct resource_list *rl = NULL;
2743
2744         rl = BUS_GET_RESOURCE_LIST(dev, child);
2745         if (!rl)
2746                 return(NULL);
2747
2748         return(resource_list_alloc(rl, dev, child, type, rid,
2749             start, end, count, flags));
2750 }
2751
2752 int
2753 bus_generic_child_present(device_t bus, device_t child)
2754 {
2755         return(BUS_CHILD_PRESENT(device_get_parent(bus), bus));
2756 }
2757
2758
2759 /*
2760  * Some convenience functions to make it easier for drivers to use the
2761  * resource-management functions.  All these really do is hide the
2762  * indirection through the parent's method table, making for slightly
2763  * less-wordy code.  In the future, it might make sense for this code
2764  * to maintain some sort of a list of resources allocated by each device.
2765  */
2766 int
2767 bus_alloc_resources(device_t dev, struct resource_spec *rs,
2768     struct resource **res)
2769 {
2770         int i;
2771
2772         for (i = 0; rs[i].type != -1; i++)
2773                 res[i] = NULL;
2774         for (i = 0; rs[i].type != -1; i++) {
2775                 res[i] = bus_alloc_resource_any(dev,
2776                     rs[i].type, &rs[i].rid, rs[i].flags);
2777                 if (res[i] == NULL) {
2778                         bus_release_resources(dev, rs, res);
2779                         return (ENXIO);
2780                 }
2781         }
2782         return (0);
2783 }
2784
2785 void
2786 bus_release_resources(device_t dev, const struct resource_spec *rs,
2787     struct resource **res)
2788 {
2789         int i;
2790
2791         for (i = 0; rs[i].type != -1; i++)
2792                 if (res[i] != NULL) {
2793                         bus_release_resource(
2794                             dev, rs[i].type, rs[i].rid, res[i]);
2795                         res[i] = NULL;
2796                 }
2797 }
2798
2799 struct resource *
2800 bus_alloc_resource(device_t dev, int type, int *rid, u_long start, u_long end,
2801                    u_long count, u_int flags)
2802 {
2803         if (dev->parent == 0)
2804                 return(0);
2805         return(BUS_ALLOC_RESOURCE(dev->parent, dev, type, rid, start, end,
2806                                   count, flags));
2807 }
2808
2809 int
2810 bus_activate_resource(device_t dev, int type, int rid, struct resource *r)
2811 {
2812         if (dev->parent == 0)
2813                 return(EINVAL);
2814         return(BUS_ACTIVATE_RESOURCE(dev->parent, dev, type, rid, r));
2815 }
2816
2817 int
2818 bus_deactivate_resource(device_t dev, int type, int rid, struct resource *r)
2819 {
2820         if (dev->parent == 0)
2821                 return(EINVAL);
2822         return(BUS_DEACTIVATE_RESOURCE(dev->parent, dev, type, rid, r));
2823 }
2824
2825 int
2826 bus_release_resource(device_t dev, int type, int rid, struct resource *r)
2827 {
2828         if (dev->parent == 0)
2829                 return(EINVAL);
2830         return(BUS_RELEASE_RESOURCE(dev->parent, dev, type, rid, r));
2831 }
2832
2833 int
2834 bus_setup_intr(device_t dev, struct resource *r, int flags,
2835                driver_intr_t handler, void *arg,
2836                void **cookiep, lwkt_serialize_t serializer)
2837 {
2838         if (dev->parent == 0)
2839                 return(EINVAL);
2840         return(BUS_SETUP_INTR(dev->parent, dev, r, flags, handler, arg,
2841                               cookiep, serializer));
2842 }
2843
2844 int
2845 bus_teardown_intr(device_t dev, struct resource *r, void *cookie)
2846 {
2847         if (dev->parent == 0)
2848                 return(EINVAL);
2849         return(BUS_TEARDOWN_INTR(dev->parent, dev, r, cookie));
2850 }
2851
2852 void
2853 bus_enable_intr(device_t dev, void *cookie)
2854 {
2855         if (dev->parent)
2856                 BUS_ENABLE_INTR(dev->parent, dev, cookie);
2857 }
2858
2859 int
2860 bus_disable_intr(device_t dev, void *cookie)
2861 {
2862         if (dev->parent)
2863                 return(BUS_DISABLE_INTR(dev->parent, dev, cookie));
2864         else
2865                 return(0);
2866 }
2867
2868 int
2869 bus_set_resource(device_t dev, int type, int rid,
2870                  u_long start, u_long count)
2871 {
2872         return(BUS_SET_RESOURCE(device_get_parent(dev), dev, type, rid,
2873                                 start, count));
2874 }
2875
2876 int
2877 bus_get_resource(device_t dev, int type, int rid,
2878                  u_long *startp, u_long *countp)
2879 {
2880         return(BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid,
2881                                 startp, countp));
2882 }
2883
2884 u_long
2885 bus_get_resource_start(device_t dev, int type, int rid)
2886 {
2887         u_long start, count;
2888         int error;
2889
2890         error = BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid,
2891                                  &start, &count);
2892         if (error)
2893                 return(0);
2894         return(start);
2895 }
2896
2897 u_long
2898 bus_get_resource_count(device_t dev, int type, int rid)
2899 {
2900         u_long start, count;
2901         int error;
2902
2903         error = BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid,
2904                                  &start, &count);
2905         if (error)
2906                 return(0);
2907         return(count);
2908 }
2909
2910 void
2911 bus_delete_resource(device_t dev, int type, int rid)
2912 {
2913         BUS_DELETE_RESOURCE(device_get_parent(dev), dev, type, rid);
2914 }
2915
2916 int
2917 bus_child_present(device_t child)
2918 {
2919         return (BUS_CHILD_PRESENT(device_get_parent(child), child));
2920 }
2921
2922 int
2923 bus_child_pnpinfo_str(device_t child, char *buf, size_t buflen)
2924 {
2925         device_t parent;
2926
2927         parent = device_get_parent(child);
2928         if (parent == NULL) {
2929                 *buf = '\0';
2930                 return (0);
2931         }
2932         return (BUS_CHILD_PNPINFO_STR(parent, child, buf, buflen));
2933 }
2934
2935 int
2936 bus_child_location_str(device_t child, char *buf, size_t buflen)
2937 {
2938         device_t parent;
2939
2940         parent = device_get_parent(child);
2941         if (parent == NULL) {
2942                 *buf = '\0';
2943                 return (0);
2944         }
2945         return (BUS_CHILD_LOCATION_STR(parent, child, buf, buflen));
2946 }
2947
2948 static int
2949 root_print_child(device_t dev, device_t child)
2950 {
2951         return(0);
2952 }
2953
2954 static int
2955 root_setup_intr(device_t dev, device_t child, driver_intr_t *intr, void *arg,
2956                 void **cookiep, lwkt_serialize_t serializer)
2957 {
2958         /*
2959          * If an interrupt mapping gets to here something bad has happened.
2960          */
2961         panic("root_setup_intr");
2962 }
2963
2964 /*
2965  * If we get here, assume that the device is permanant and really is
2966  * present in the system.  Removable bus drivers are expected to intercept
2967  * this call long before it gets here.  We return -1 so that drivers that
2968  * really care can check vs -1 or some ERRNO returned higher in the food
2969  * chain.
2970  */
2971 static int
2972 root_child_present(device_t dev, device_t child)
2973 {
2974         return(-1);
2975 }
2976
2977 /*
2978  * XXX NOTE! other defaults may be set in bus_if.m
2979  */
2980 static kobj_method_t root_methods[] = {
2981         /* Device interface */
2982         KOBJMETHOD(device_shutdown,     bus_generic_shutdown),
2983         KOBJMETHOD(device_suspend,      bus_generic_suspend),
2984         KOBJMETHOD(device_resume,       bus_generic_resume),
2985
2986         /* Bus interface */
2987         KOBJMETHOD(bus_add_child,       bus_generic_add_child),
2988         KOBJMETHOD(bus_print_child,     root_print_child),
2989         KOBJMETHOD(bus_read_ivar,       bus_generic_read_ivar),
2990         KOBJMETHOD(bus_write_ivar,      bus_generic_write_ivar),
2991         KOBJMETHOD(bus_setup_intr,      root_setup_intr),
2992         KOBJMETHOD(bus_child_present,   root_child_present),
2993
2994         { 0, 0 }
2995 };
2996
2997 static driver_t root_driver = {
2998         "root",
2999         root_methods,
3000         1,                      /* no softc */
3001 };
3002
3003 device_t        root_bus;
3004 devclass_t      root_devclass;
3005
3006 static int
3007 root_bus_module_handler(module_t mod, int what, void* arg)
3008 {
3009         switch (what) {
3010         case MOD_LOAD:
3011                 TAILQ_INIT(&bus_data_devices);
3012                 root_bus = make_device(NULL, "root", 0);
3013                 root_bus->desc = "System root bus";
3014                 kobj_init((kobj_t) root_bus, (kobj_class_t) &root_driver);
3015                 root_bus->driver = &root_driver;
3016                 root_bus->state = DS_ALIVE;
3017                 root_devclass = devclass_find_internal("root", NULL, FALSE);
3018                 devinit();
3019                 return(0);
3020
3021         case MOD_SHUTDOWN:
3022                 device_shutdown(root_bus);
3023                 return(0);
3024         default:
3025                 return(0);
3026         }
3027 }
3028
3029 static moduledata_t root_bus_mod = {
3030         "rootbus",
3031         root_bus_module_handler,
3032         0
3033 };
3034 DECLARE_MODULE(rootbus, root_bus_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
3035
3036 void
3037 root_bus_configure(void)
3038 {
3039         int warncount;
3040         device_t dev;
3041
3042         PDEBUG(("."));
3043
3044         /*
3045          * handle device_identify based device attachments to the root_bus
3046          * (typically nexus).
3047          */
3048         bus_generic_probe(root_bus);
3049
3050         /*
3051          * Probe and attach the devices under root_bus.
3052          */
3053         TAILQ_FOREACH(dev, &root_bus->children, link) {
3054                 device_probe_and_attach(dev);
3055         }
3056
3057         /*
3058          * Wait for all asynchronous attaches to complete.  If we don't
3059          * our legacy ISA bus scan could steal device unit numbers or
3060          * even I/O ports.
3061          */
3062         warncount = 10;
3063         if (numasyncthreads)
3064                 kprintf("Waiting for async drivers to attach\n");
3065         while (numasyncthreads > 0) {
3066                 if (tsleep(&numasyncthreads, 0, "rootbus", hz) == EWOULDBLOCK)
3067                         --warncount;
3068                 if (warncount == 0) {
3069                         kprintf("Warning: Still waiting for %d "
3070                                 "drivers to attach\n", numasyncthreads);
3071                 } else if (warncount == -30) {
3072                         kprintf("Giving up on %d drivers\n", numasyncthreads);
3073                         break;
3074                 }
3075         }
3076         root_bus->state = DS_ATTACHED;
3077 }
3078
3079 int
3080 driver_module_handler(module_t mod, int what, void *arg)
3081 {
3082         int error;
3083         struct driver_module_data *dmd;
3084         devclass_t bus_devclass;
3085         kobj_class_t driver;
3086         const char *parentname;
3087
3088         dmd = (struct driver_module_data *)arg;
3089         bus_devclass = devclass_find_internal(dmd->dmd_busname, NULL, TRUE);
3090         error = 0;
3091
3092         switch (what) {
3093         case MOD_LOAD:
3094                 if (dmd->dmd_chainevh)
3095                         error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);
3096
3097                 driver = dmd->dmd_driver;
3098                 PDEBUG(("Loading module: driver %s on bus %s",
3099                         DRIVERNAME(driver), dmd->dmd_busname));
3100
3101                 /*
3102                  * If the driver has any base classes, make the
3103                  * devclass inherit from the devclass of the driver's
3104                  * first base class. This will allow the system to
3105                  * search for drivers in both devclasses for children
3106                  * of a device using this driver.
3107                  */
3108                 if (driver->baseclasses)
3109                         parentname = driver->baseclasses[0]->name;
3110                 else
3111                         parentname = NULL;
3112                 *dmd->dmd_devclass = devclass_find_internal(driver->name,
3113                                                             parentname, TRUE);
3114
3115                 error = devclass_add_driver(bus_devclass, driver);
3116                 if (error)
3117                         break;
3118                 break;
3119
3120         case MOD_UNLOAD:
3121                 PDEBUG(("Unloading module: driver %s from bus %s",
3122                         DRIVERNAME(dmd->dmd_driver), dmd->dmd_busname));
3123                 error = devclass_delete_driver(bus_devclass, dmd->dmd_driver);
3124
3125                 if (!error && dmd->dmd_chainevh)
3126                         error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);
3127                 break;
3128         }
3129
3130         return (error);
3131 }
3132
3133 #ifdef BUS_DEBUG
3134
3135 /*
3136  * The _short versions avoid iteration by not calling anything that prints
3137  * more than oneliners. I love oneliners.
3138  */
3139
3140 static void
3141 print_device_short(device_t dev, int indent)
3142 {
3143         if (!dev)
3144                 return;
3145
3146         indentprintf(("device %d: <%s> %sparent,%schildren,%s%s%s%s,%sivars,%ssoftc,busy=%d\n",
3147                       dev->unit, dev->desc,
3148                       (dev->parent? "":"no "),
3149                       (TAILQ_EMPTY(&dev->children)? "no ":""),
3150                       (dev->flags&DF_ENABLED? "enabled,":"disabled,"),
3151                       (dev->flags&DF_FIXEDCLASS? "fixed,":""),
3152                       (dev->flags&DF_WILDCARD? "wildcard,":""),
3153                       (dev->flags&DF_DESCMALLOCED? "descmalloced,":""),
3154                       (dev->ivars? "":"no "),
3155                       (dev->softc? "":"no "),
3156                       dev->busy));
3157 }
3158
3159 static void
3160 print_device(device_t dev, int indent)
3161 {
3162         if (!dev)
3163                 return;
3164
3165         print_device_short(dev, indent);
3166
3167         indentprintf(("Parent:\n"));
3168         print_device_short(dev->parent, indent+1);
3169         indentprintf(("Driver:\n"));
3170         print_driver_short(dev->driver, indent+1);
3171         indentprintf(("Devclass:\n"));
3172         print_devclass_short(dev->devclass, indent+1);
3173 }
3174
3175 /*
3176  * Print the device and all its children (indented).
3177  */
3178 void
3179 print_device_tree_short(device_t dev, int indent)
3180 {
3181         device_t child;
3182
3183         if (!dev)
3184                 return;
3185
3186         print_device_short(dev, indent);
3187
3188         TAILQ_FOREACH(child, &dev->children, link)
3189                 print_device_tree_short(child, indent+1);
3190 }
3191
3192 /*
3193  * Print the device and all its children (indented).
3194  */
3195 void
3196 print_device_tree(device_t dev, int indent)
3197 {
3198         device_t child;
3199
3200         if (!dev)
3201                 return;
3202
3203         print_device(dev, indent);
3204
3205         TAILQ_FOREACH(child, &dev->children, link)
3206                 print_device_tree(child, indent+1);
3207 }
3208
3209 static void
3210 print_driver_short(driver_t *driver, int indent)
3211 {
3212         if (!driver)
3213                 return;
3214
3215         indentprintf(("driver %s: softc size = %zu\n",
3216                       driver->name, driver->size));
3217 }
3218
3219 static void
3220 print_driver(driver_t *driver, int indent)
3221 {
3222         if (!driver)
3223                 return;
3224
3225         print_driver_short(driver, indent);
3226 }
3227
3228
3229 static void
3230 print_driver_list(driver_list_t drivers, int indent)
3231 {
3232         driverlink_t driver;
3233
3234         TAILQ_FOREACH(driver, &drivers, link)
3235                 print_driver(driver->driver, indent);
3236 }
3237
3238 static void
3239 print_devclass_short(devclass_t dc, int indent)
3240 {
3241         if (!dc)
3242                 return;
3243
3244         indentprintf(("devclass %s: max units = %d\n", dc->name, dc->maxunit));
3245 }
3246
3247 static void
3248 print_devclass(devclass_t dc, int indent)
3249 {
3250         int i;
3251
3252         if (!dc)
3253                 return;
3254
3255         print_devclass_short(dc, indent);
3256         indentprintf(("Drivers:\n"));
3257         print_driver_list(dc->drivers, indent+1);
3258
3259         indentprintf(("Devices:\n"));
3260         for (i = 0; i < dc->maxunit; i++)
3261                 if (dc->devices[i])
3262                         print_device(dc->devices[i], indent+1);
3263 }
3264
3265 void
3266 print_devclass_list_short(void)
3267 {
3268         devclass_t dc;
3269
3270         kprintf("Short listing of devclasses, drivers & devices:\n");
3271         TAILQ_FOREACH(dc, &devclasses, link) {
3272                 print_devclass_short(dc, 0);
3273         }
3274 }
3275
3276 void
3277 print_devclass_list(void)
3278 {
3279         devclass_t dc;
3280
3281         kprintf("Full listing of devclasses, drivers & devices:\n");
3282         TAILQ_FOREACH(dc, &devclasses, link) {
3283                 print_devclass(dc, 0);
3284         }
3285 }
3286
3287 #endif
3288
3289 /*
3290  * Check to see if a device is disabled via a disabled hint.
3291  */
3292 int
3293 resource_disabled(const char *name, int unit)
3294 {
3295         int error, value;
3296
3297         error = resource_int_value(name, unit, "disabled", &value);
3298         if (error)
3299                return(0);
3300         return(value);
3301 }
3302
3303 /*
3304  * User-space access to the device tree.
3305  *
3306  * We implement a small set of nodes:
3307  *
3308  * hw.bus                       Single integer read method to obtain the
3309  *                              current generation count.
3310  * hw.bus.devices               Reads the entire device tree in flat space.
3311  * hw.bus.rman                  Resource manager interface
3312  *
3313  * We might like to add the ability to scan devclasses and/or drivers to
3314  * determine what else is currently loaded/available.
3315  */
3316
3317 static int
3318 sysctl_bus(SYSCTL_HANDLER_ARGS)
3319 {
3320         struct u_businfo        ubus;
3321
3322         ubus.ub_version = BUS_USER_VERSION;
3323         ubus.ub_generation = bus_data_generation;
3324
3325         return (SYSCTL_OUT(req, &ubus, sizeof(ubus)));
3326 }
3327 SYSCTL_NODE(_hw_bus, OID_AUTO, info, CTLFLAG_RW, sysctl_bus,
3328     "bus-related data");
3329
3330 static int
3331 sysctl_devices(SYSCTL_HANDLER_ARGS)
3332 {
3333         int                     *name = (int *)arg1;
3334         u_int                   namelen = arg2;
3335         int                     index;
3336         struct device           *dev;
3337         struct u_device         udev;   /* XXX this is a bit big */
3338         int                     error;
3339
3340         if (namelen != 2)
3341                 return (EINVAL);
3342
3343         if (bus_data_generation_check(name[0]))
3344                 return (EINVAL);
3345
3346         index = name[1];
3347
3348         /*
3349          * Scan the list of devices, looking for the requested index.
3350          */
3351         TAILQ_FOREACH(dev, &bus_data_devices, devlink) {
3352                 if (index-- == 0)
3353                         break;
3354         }
3355         if (dev == NULL)
3356                 return (ENOENT);
3357
3358         /*
3359          * Populate the return array.
3360          */
3361         bzero(&udev, sizeof(udev));
3362         udev.dv_handle = (uintptr_t)dev;
3363         udev.dv_parent = (uintptr_t)dev->parent;
3364         if (dev->nameunit != NULL)
3365                 strlcpy(udev.dv_name, dev->nameunit, sizeof(udev.dv_name));
3366         if (dev->desc != NULL)
3367                 strlcpy(udev.dv_desc, dev->desc, sizeof(udev.dv_desc));
3368         if (dev->driver != NULL && dev->driver->name != NULL)
3369                 strlcpy(udev.dv_drivername, dev->driver->name,
3370                     sizeof(udev.dv_drivername));
3371         bus_child_pnpinfo_str(dev, udev.dv_pnpinfo, sizeof(udev.dv_pnpinfo));
3372         bus_child_location_str(dev, udev.dv_location, sizeof(udev.dv_location));
3373         udev.dv_devflags = dev->devflags;
3374         udev.dv_flags = dev->flags;
3375         udev.dv_state = dev->state;
3376         error = SYSCTL_OUT(req, &udev, sizeof(udev));
3377         return (error);
3378 }
3379
3380 SYSCTL_NODE(_hw_bus, OID_AUTO, devices, CTLFLAG_RD, sysctl_devices,
3381     "system device tree");
3382
3383 int
3384 bus_data_generation_check(int generation)
3385 {
3386         if (generation != bus_data_generation)
3387                 return (1);
3388
3389         /* XXX generate optimised lists here? */
3390         return (0);
3391 }
3392
3393 void
3394 bus_data_generation_update(void)
3395 {
3396         bus_data_generation++;
3397 }
3398
3399 const char *
3400 intr_str_polarity(enum intr_polarity pola)
3401 {
3402         switch (pola) {
3403         case INTR_POLARITY_LOW:
3404                 return "low";
3405
3406         case INTR_POLARITY_HIGH:
3407                 return "high";
3408
3409         case INTR_POLARITY_CONFORM:
3410                 return "conform";
3411         }
3412         return "unknown";
3413 }
3414
3415 const char *
3416 intr_str_trigger(enum intr_trigger trig)
3417 {
3418         switch (trig) {
3419         case INTR_TRIGGER_EDGE:
3420                 return "edge";
3421
3422         case INTR_TRIGGER_LEVEL:
3423                 return "level";
3424
3425         case INTR_TRIGGER_CONFORM:
3426                 return "conform";
3427         }
3428         return "unknown";
3429 }